The first episode of Opposing Force has you flying into the Black Mesa Research Facility in New Mexico for an unspecified mission. It appears at first glance to be a babysitting job, but the ride inbound quickly proves otherwise, and you immediately find yourself in serious trouble.
You'll quickly want to get on your feet and grab some weapons to defend yourself. There are a few interesting puzzles in this episode, but stay alert and you'll begin to make your way safely to your extraction point.
During the opening sequence, don't forget to look around -- events happen outside that you don't want to miss.
After waking up in the laboratory, listen to the scientist and head out to get your PCV vest. It is on a table in the area where the scientists are examining alien specimens. There is a scripted sequence where a zombie throws a scientist through a glass window, and then begins to chase you. Don't let him catch you by surprise.
After getting your vest, head down to the area where a security guard is shooting a zombie. After he kills the zombie, talk to him and have him open the security doors. He will only open the doors if you have your vest.
After going through the doors, pick up the red pipe wrench on the floor. This will be your primary weapon for a bit, so don't miss it!
You'll come across a lab room with lasers blocking your path. Crouch under the lasers, and then smash the mirror with the purple laser with the wrench. This will cause a chain reaction that will deactivate the lasers and allow you to continue to the next area.
Continue through the hallways and head outside to the cliff face. You'll have to do some jumping to make your way to the exit door, and be sure to pick up the knife by the dead Vortigaunt.
Once through the door, crawl through the hole in the rock and emerge outside where you'll find a downed chopper. You'll need to pass the chopper to progress, but first you'll have to turn off the power or you'll get electrocuted.
Head over to the area where the generators are fenced off, and watch as a security guard falls victim to a now-electrified fence. The power switch is behind those gates, but you'll have to access it through the vent on the side.
Use your night vision to find your way through the vent, and be sure not to get zapped by the electricty when you emerge inside the fenced area. Find the power switch, turn it off, and leave via the now unlocked gate. Don't miss the pistol on the floor next to the security guard before heading back.
Once back at the chopper, listen to the radio, where you're told to make your way to the extraction point. Head underground via the nearby ladder, and continue until you run across a Vortigaunt. Shoot him, grab the shotgun next to the dead Marine, and continue.
You'll eventually come to a room where all sorts of bad things are about to happen. As soon as you near what looks like the exit, everything starts to explode -- the floor starts breaking away, the room begins to fill with radioactive sludge, and the ladder leading out of the slime becomes electrified.
Once the room starts to collapse, head back to the entrance of the room and stay to the far right. Wait there as the rest of the floor collapses around you, and a catwalk should drop right in front of you, providing a path to the beams above. Go up and look around -- you'll see one of the doors has a window next to it, where the G-Man will appear and open the exit door for you. Head across the beams and exit to safety.
Continuing downstairs, you'll reach a room flooded with more electrified sludge. To continue, you'll have to jump across and find the control room to operate the conveyor. Move the platform from right to left, and use the platform as a bridge for you to climb over.
Look for a broken pipe in the wall and drop down further into the sewers. Swim around for a bit and you should find a ladder in the corner leading back up.
You'll eventually emerge above a loading area flooded with yet more radioactive sludge. There's a drainage control below, but access to the lower area is cut off during loading, and the loader is currently stuck behind some crates. Shoot the explosive crate, which will allow the loader to finish its job and allow access below. Climb down and across the crates to the drainage control, and drain the room.
Open the door and head up the elevator, where you'll meet a few Houndeyes and an empty tram car. After dispatching of the Houndeyes, move the cart across the floor until it's directly in front of the tram, providing a bridge. Carefully make the jump into the tram, and it will automatically start up, ending the episode.
EPISODE 2 - WE ARE PULLING OUT (iNSiDERS)
You continue to make your way to your team's extraction point, but once there, things don't go exactly as you might have hoped.
Ride the tram as it begins to climb upward. Vortigaunts will appear outside -- either stay low, or shoot them as they pop up. Once the tram docks, get out and kill the remaining Vortigaunts that appear.
A few steps away, you'll meet a chubby security guard, who currently has his hand stuck in a vending machine. Get him to follow you, and he'll take out most of the enemies that follow.
Upstairs, you'll come to a locked door. Through a window you'll see Barney and Walter chatting, who then get a rude surprise, which upon its conclusion will shatter the glass window. Enter the room via the window, and unlock the door from the other side, allowing Otis in.
Continue along and break the glass if you'd like to talk to the scientist inside the next room. While you're doing that, Otis will unlock a closet with MP5 grenades and ammo.
Hop on the platform at the end of the hall and head upward, where a marine is fighting a losing battle with some Vortigaunts. Finish the aliens and grab the MP5 by the dead Marine's feet.
The door is locked, but there is a vent above the HEV charger. Use the crates to climb up, break the vent's opening, and travel through until you emerge at what appears to be the extraction point.
Once in the base, you can see the extraction helicopter waiting outside -- there's even a Marine waving at you to hurry. Collect as much as you can before proceeding -- you won't be able to retrace your steps shortly.
Upon nearing the outside exit, the hangar door will suddenly close, the G-Man on the other side. The fire door leading back upstairs will also shut, effectively sealing you in while the helicopter takes off, leaving you behind.
A few seconds later, Vortigaunts will break into your area. Eliminate them and escape through the opening one of aliens created when it broke in...
EPISODE 3 - MISSING IN ACTION (iNSiDERS)
One of the larger episodes in Opposing Force, "Missing In Action" follows Shephard as he continues along the only path available to him, trying to figure out his next move. There are five distinct areas to the episode, each of which present special challenges.
Ventiliation Area
Make your way through the pipe area until you reach a small clearing. Clear the Vortigaunts away, and ransack the crates. In the corner of this area are some stacked vent pipes providing access to a vent. Break the vent opening and climb in.
As you make your way through the vent, break the first opening in the vent floor that you see. Drop through, and you'll find yourself in a ceiling area.
Some of the ceiling tiles here are unstable and will collapse, sending you into the electrified water below. With night vision off, it should be easy to tell which tiles are safe and which are not, as weak tiles have a slight discoloration. Make your way through the ceiling area until you reach a ventilation area with two huge fans.
Walk across the beams supporting the fans, and make your way to the opening on the other side. Drop down on the catwalk and continue until you are facing two more fans. Walk on the path directly between them and drop down to find yet a third set of two fans.
One of the fans here has only one blade, and a vent opening underneath it. Time your move correctly, and climb into and down the vent.
Furnace Area
At the bottom of the vent, smash your way out and you'll emerge in a large furnace area. Time your movements and make your way to the far side. The door is locked, but thankfully, there's yet another vent to sneak into.
You'll emerge from the vent at a second set of furnaces. This time, you'll need to make your way to the furnace receptacle at the far left, and climb in when there's no fire blowing through. Before making your move, arm yourself and prepare to fight after running through.
You'll emerge at a third furnace area, where a group of zombies has set up a cozy little nest. Take out the zombies as quickly as possible and prepare for your next move.
At first glance, it would appear you're trapped in this furnace/nest area. However, on a little ramp is a furnace with a "test fire" button on it. Above the furnace is a sign clearly stating "do not block test fire area", and the entire area is loaded with explosive crates. Hmmm...
Find the one movable explosive metal crate and place it in the furnace's test fire path. Press the button and stand back. The crates should all explode, ripping a huge hole in the floor, providing your escape path.
Drop down the hole, make your way down the mini-cave, and climb in the vent at the end. Climb out of the vent into a spacious underground cavern area, and make your way down to a army truck and a dying marine, who has a few final words of warning for you.
Garage Area
Continue past the now-dead marine and down the ramp. Break every crate you can, and eliminate all aliens in the area before pressing the button to open the garage door. The door on the right will open, revealing yet more aliens. Lob in a few grenades and satchels to soften them up before heading in.
Once in the garage, continue going through all the crates. One of the last crates will contain a RPG launcher.
Upon rounding the corner, you'll encounter yet more aliens, an elevator shaft, and a very frightened scientist. Peering into the elevator shaft, you'll see openings both high and low, but the only way up looks to be via a dangling cable, which is electrified at the moment. Head downward.
Elevator Shaft Area
Use the access ladders on the walls to make your way downward, and jump onto the roof of the crashed elevator. Climb across the elevator roof to the office floor.
Find your way around the office floor, being careful not to slip on the wet floor into another dangling electric cable. Climb over the crates, find the power room, and turn the power off.
Head back to the elevator shaft and climb the ladders as high as you can go. You should be able to make an easy jump from here to the dangling elevator cable. Climb the cable, and swing your way to the roof of the other elevator. Make your way across the roof of the elevator onto the office floor.
Office Floor
From here, you'll need to make your way across the office floor, with a single metal crate as your main ally. The first door you find is locked, but there's a vent nearby. Use the crate to climb into it.
You'll see a scientist at the end of the vent, but halfway through, an explosion will rip the vent in half. Climb out and onto the top of the broken vent, which will allow you to climb back into the remainder of the ventilation duct. Make your way to the scientist, and the power cell next to him, and then drop down into the office floor.
Open the door behind you and reclaim your crate. Use it to climb over a pile of rubble next to an office.
Once again you're faced with a locked door and a vent, but no crate to reach the vent. Break the glass in the office window and lob the grenade (conveniently left nearby) in. The entire office will explode, leaving you plenty of room to drag your beloved crate around to access the next vent.
Drop down from the vent into the next office, where you'll find a scientist lying electrocuted on a table. Make your way around the hallway to a hole in floor, where you'll find yet another frightened scientist. Climb down, turn off the power at the end of the hallway and climb up the now-dead electrical cable back into the office complex.
At this point, you would appear to be at a dead end, with both doors in the room locked. However, you can hear soldiers nearby. Use the radio in the room, and an engineer and a soldier will promptly blow up one of the doors to reach you.
Use the engineer to break open the remaining door, pile everyone you can into the elevator you find there, and head downward.
EPISODE 4 - FRIENDLY FIRE (iNSiDERS)
This episode contains some of the nastiest combat in Opposing Force. You'll be forced to fight both hordes of aliens and Special Ops troops, and you'll need all the help you can get. Don't waste time fighting if you don't have to -- ammo is a precious commodity here, and you don't want to expend it unless necessary.
The office area where you get off the elevator is loaded with HORDES of aliens. Use grenades, satchels, rockets...anything that can take out more than one enemy at once, and make your way to an office upstairs with a hole in the ceiling.
In the ceiling you'll find a small walkway with a broken bridge. Jump the bridge, open the doorway, and make sure you have some long range weaponry when you turn the corner.
If you peek around the corner quickly, you'll see a large electrified pool of sludge guarded by two large alien grunts, armed with Hivehands. The bridge leading across the sludge is broken, and you'll need to take out the aliens quickly or the hornets will finish you off quick.
Behind one of the aliens is a large pile of explosive crates. Blow them up as quickly as possible with a long range weapon, which will take out the first alien. Quickly turn your attention to the second alien and take him out ASAP with anything you've got. Once you've dispactched of the aliens, you can take a breather and turn your attention to finding a way across the sludge.
Above the sludge are two electrified cables. Shoot out the crystals on the left wall, which will cause a chain reaction cutting the power. You can then swing from cable to cable and make your way to the other side and around the catwalk.
Ride the short elevator and take out the Houndeyes you meet there. Climb up the girders outside to the surface, and you'll meet a Medic with a plan: There's a transit system nearby which should take you to an extraction point at Lambda sector, but the door is sealed. If only you had an engineer...
DO NOT open the other door. There's a turret behind it which can be taken out fairly easy from the other side. Instead, climb in a nearby vent, and when you turn the corner, watch and listen to the two Black Ops talk about how they want to simply "deliver the package and get out of here".
Getting out of the vent and into the hangar area is tricky. You'll want to use the medic and be fully healed before fighting the Black Ops, and you'll need to use plenty of grenades and long range weapons to survive. Make sure you always have plenty of cover, and retreat outside to let the Medic heal you if necessary.
Once you've cleared out all the Black Ops, raise one of the garage doors to reveal a badly hurt Engineer. Leave him for the moment.
Return outside, but this time look for a boarded-up door in the hangar (the board may get knocked off while fighting the Black Ops). Behind the door is the same turret you avoided earlier, but this time it's not aimed at you, and it conveniently has two laser tripmines surrounding it. Get some distance, lob in a grenade, and take out the turret.
Go outside and bring the Medic to the Engineer, using the doorway you just cleared, and the Medic will heal the Engineer. Bring them both outside, where the Engineer will then blowtorch the door leading to the transit system open. At this point, you should decide if whether you want to keep your engineer alive or not.
When the door is blown open, a turret will be waiting for you. It will usually rip right through the engineer -- unless you're waiting behind him with an MP5 grenade, which can take the turret out fairly quickly. If you're fast enough, you'll both take some damage, but can use the Medic to heal you both. Continue through the passageway, lobbing a grenade ahead to clear tripmines in your way.
Going around the corner, you'll meet more soldiers - one wearing a gas mask, and another wielding an M-249 machinegun, its first appearance of the game. The two soldiers are very nervous, and are looking for a transit car. This is a prelude to another intense battle with the Black Ops forces, who stand between you and a switch opening the doorway to the transit system.
Attacking the Black Ops here is a very tricky proposition; not only are the special forces extremely hard to kill, but you'll also have to deal with friendly fire from your two new recruits, who are just as likely to hit you during the shootout as the assassins. Once you hit the switch to open the door and return safely, you may want to kill the soldier with the M-249, which will come in quite handy shortly.
Once the door is open, walk along the side path and prepare for loads of combat with more Black Ops forces. If you move ahead too fast, they will quickly surround you from all sides, so be prepared to take your time, lobbing grenades ahead to soften up the enemy, and to retreat often. You should also lean on the MP5 here, as most of the Black Ops use them and you might as well take advantage of all the excess ammo lying around.
At the end of the track, you'll find a transit car. Back it up a short bit so it's positioned in front of the fork in the track. Shoot the switch to change the track, and move the car up to the door.
Nearby is a stairway leading to a switch that will open the door for the car to go through. Flip the switch, retrace your steps, and drive the car through the now-open passageway.
When you reach the end of the track, you'll need to kill a few more Ops, and then find a small office with a hole in the ceiling. Maneuver a nearby crate and barrel to climb into the ceiling, and exit the crawlspace into a hallway in the Lambda lab complex, where you're about to see a familiar figure...
EPISODE 5 - WE ARE NOT ALONE (iNSiDERS)
This is one of the shortest episodes in Opposing Force, but also one of the most memorable. It revisits one of the best moments of Half-Life, and contains a few other secret goodies if you know where to look.
Upon starting the episode, you'll hear a scientist calling out to someone, telling him to "hurry before the portal closes". As fast as you can race around to the lab doorway, you'll only be able to catch a glimpse of everyone's favorite scientist as he jumps into the teleporter.
You'll then be left with a bunch of floating aliens looking to do you harm. Heading around the teleporter, a catwalk will collapse, making a ramp with a teleportation ball at the top. Run up the makeshift ramp and jump into the glowing teleporter....
After entering the transporter, you'll reappear high upon a floating ledge in a alien world. Gravity is much lower here, and your goal will be to jump from ledge to ledge to reach a teleport ball high in the sky. You'll need to use the alien jump pads found on a few platforms, and you should save often here, as one false step will spell certain doom.
Your first jump should put you in view of a dead scientist, who has just recently transported himself here. Jump over and pick up the transporter gun next to him.
Side Note: If you use the gun's secondary fire, you'll be transported to the "Hazard Course" from Half-Life (!), where you'll find a very confused Vortigaunt swiping at the holographic trainer, to no avail. If you climb up the side of the room, you can break the window to the observation area, and use a med station to heal yourself if necessary. The teleport ball there will send you back exactly to where you came from, on the floating ledge with the dead scientist. You can also use the transporter gun at any time to send yourself back to various locations in Xen to heal yourself at any time (provided you have ammo for the gun.)
From here, look up and try to spot a few houndeyes on a ledge high above. Your goal will be the ledge next to them. To make the jump, you'll have to run onto the jump pad moving in the direction of your destination, and your momentum will carry you over. Otherwise, Xen's air physics will not allow you to maneuver to the ledge.
Once on the platform near the houndeyes, it should be easy to reach the glowing teleport ball in the sky. Upon teleporting, you'll find yourself in an underwater lab...
EPISODE 6 - CRUSH DEPTH (iNSiDERS)
This episode finds you in an underwater lab, trying to make your way back to the surface. It seems as though some interesting experiments have been going on here, so be prepared for anything.
After jumping into the teleporter on Xen, you appear in a rubble-filled hallway next to an elevator. Hop in the elevator and go down.
Upon leaving the elevator, make a right and continue until you find a scientist in an underwater tank. Don't get caught off guard listening to him, though - there are a few aliens behind the control panel waiting to attack. Take them out, and then press the button on the control panel to transport the scientist back into the lab.
Lead the scientist back around the hallway and have him open the first security door for you.
There's a second security door after this, with a bullsquid on the way next to three small water tanks. Don't bother with the second security door, as the scientist will be electrocuted before he can get the door open. Kill the bullsquid and climb up the ladder in the empty water tank.
At the top of the ladder, you'll be attacked by a small horde of aliens in the ceiling. After clearing them, more aliens will burst through a hole in the wall at the far end. Make your way through the ceiling to a vent, climb in, and drop down into the next lab room.
In the middle of this room is a cage similar to the one the scientist teleported in and out of. Walk in and press the button. The teleporter will misfire a few times, sending chunks of debris into the water outside the room, and then finally teleport you as well.
Under water, find the nearby open vent. Climb in and up and emerge in a darkly red lit room. Kill the zombies there and enter the small vent at the end. At the end of the vent, drop down through a few grates into the water below. Find the ladder underwater and climb onto the small dock.
Continue inside until you make your way down to a small crank. Turn the wheel and you'll see a grate in the water open, also freeing an itchyosaurus. Retrace your steps and go back to the dock.
Jump back in the water and go through the now-open vent, paying proper attention to the underwater menace. Quickly make your way to the end of the vent and close the airlock. The water will drain out, allowing you to breathe again.
When the other door in the airlock opens, you'll emerge into a decontamination room. There's a button here to press, but it will only misfire and explode. Enter the electrocuted hallway and shoot out the electrical box at the far end, cutting the power.
Head around the corner and through the decontamination shower. A few aliens will appear, including one who, when killed, will provide you with a new alien weapon.
Continue into the airlock and press the button opening the next door. Walk through the door, down the walkway and into the teleporter ball.
You'll be teleported to Xen briefly, where you can make a small jump and teleport back to yet another airlock. Press the button and open the door.
The door at the other end of this hallway is locked, but the walkway and glass beneath has been shattered. Climb through the hole in the glass into the water, and swim up to the vent in the underwater ceiling. Break the grate open and climb out into a small cave.
EPISODE 7 - VICARIOUS REALITY (iNSiDERS)
You'll continue your journey underground, meeting all sorts of nasty aliens along the way. This can be one of the most disorienting levels in the game, so save often and make sure you don't miss anything -- there are a few new weapons to be found here.
You'll start this level out in a small underground tunnel. Make your way around to a steel beam and go up. Watch for the electrical wire hanging overhead.
As soon as you emerge, watch out for headcrabs. Jump onto the small perimeter ledge, onto the catwalk, and around the next hallway.
You'll emerge into a small, dark curved hallway overlooking a large alien habitat. At the end of the hallway, you'll come to a locked door, at which point aliens will teleport in behind you, breaking the glass. Kill the aliens and jump through the broken window.
Down in the alien habitat, there's an open doorway leading to a small lift. Run as fast as you can and shut the door behind you if possible. When the elevator rises, the door in front of you will open. Prepare to fight.
As soon as you go through the doorway, a huge zombie will come charging. Take him out, along with the headcrabs in the room.
There are two doors exiting this room -- one is the previously locked door heading back to the observation area. Take the other door.
Go around the hallway and make your way to an elevator shaft. Break the glass and climb in the elevator. Climb out onto the roof and then up the ladder in the elevator shaft.
At the top of the elevator shaft, drop to the small ledge and look down. There's another elevator opening with a broken door providing a small platform to jump on. Jump on the door and enter the upper hallway.
Make your way around to a fork in the hallway. One path leads to an elevator going down, the other leads to a door somewhat blocked by a yellow construction sign. Take the elevator down.
When you get off the elevator, make your way past some rubble, through a doorway, and around past some aliens overlooking another alien habitat.
There's another doorway in the habitat floor -- shoot out the glass, work your way around the ledge of the habitat, drop down and head through the doorway. Activate the small lift there and go up.
You'll emerge in a room with three glass tanks holding alien specimens. The third tank is broken and the specimen is on the floor. This is actually a weapon (it uses glowing green ammo you'll find growing throughout the rest of the game) pick it up.
Continue around, through another small curved hallway, and through the doorway. Head through another doorway and take out the Houndeyes you meet. After that, you'll arrive at a room with some glass panels overlooking a red room filled with barnacles.
Press the button in front of the glass and a hologram of a scientist will appear. He'll explain that they've devised a grapple out of a barnacle...but it will only attach itself to organic matter. (This, in most cases, will appear in the form of the green alien ammo growing at various locations throughout the rest of the game.)
In the next room, grab the barnacle grapple from the broken glass case.
Continue until you come to a door marked "Specimen Cultivation Room".
You'll be confronted with a greenish room with alient ammo growing all over the walls. You'll need the grapple to cross this room, but it will be fairly hard with three aliens spitting acid at you.
Kill the aliens and then cross the room, using the grapple to attach to the alien plants. It would not be a bad idea to stock up on ammo at this point - it will regenerate after a few seconds, so don't be in a hurry to leave.
Continue through a red room with barnacles hanging everywhere. Kill the headcrabs in the room, and then exit the room via the other side, avoiding the barnicles.
EPISODE 8 - PIT WORM`S NEST (iNSiDERS)
This chapter revolves around a puzzle similar to the one found in Half-Life's "Blast Pit". There's a huge boss blocking your progress, and the only way to process is to activate a few switches and flush him away. Take your time and pick up every piece of ammo and health that you can.
You'll start the level by falling into a chamber filled with sewage. The airlock is sealed, but if you look up, you'll see the familar figure of the G-Man overlooking the area.
Soon after, the airlock will conveniently open, with a BullSquid behind it. Kill the squid, open the airlock and move on.
Avoid the slime on the other side of the door and climb the ladder. You'll arrive at the ugly scene of a small squad of dead soldiers.
Grab all the weapons/ammo you can and continue until you find "Black Mesa Waste Processing Area 3". Prepare to find something extremely nasty - the Pit Worm. (yike!)
When you first open the door, try and distract the Worm by shooting him in the eye, which will stun him briefly. When you have an opening, jump down to the first ledge and to the right. Take out the aliens you find there and round the bend to a broken ramp and another alien.
At the bottom of the ramp you'll find a locked door. Back under the broken ramp you'll find some crates and a small vent opening.
Climb in the vent and you'll emerge at a small control room overlooking the Pit Worm. In the middle of the room is a panel marked "Flush Toxic Waste", and two switches labeled (appropriately enough) "Gearbox" and "Valve". You need to light up both these panels before you can activate the flush control, but you've got some hoops to jump through first.
Exit the control room via the door marked "02". Flipping the switch will close the door behind you, and open the door in front of you.
Head around the bend, across the lower walkway in front of the pit worm, and down the long ladder. More stubby aliens abound, use the shotgun to dump them. You'll come to another sewage chamber loaded with crates.
Hop over the crates to the other side, and around the bend to a small lift. Ride the lift up and continue around the bend to a small room overlooking the sewage chamber. Press the button there and watch as the walls in the chamber close together and crush the boxes.
Run back around and down the lift to the now-narrow garbage chamber. There's a vent in the floor.
Break the grate and drop way down into the sewage. You'll eventually make your way to an override switched marked "Gearbox". Hit the switch and hit the road the room will start to flood with sewage.
Head back the way you came and ride out the tide as the sewage rises. You'll eventually be able to float back up and climb up the vent you dropped down through. Retrace your steps all the way back to the main control room overlooking the pit worm -- the "Gearbox" light should now be on. Now you need to turn the "Valve" light.
Head out the door marked "03". You'll encounter a few aliens and climb upward until you arrive at another ledge to the right of the pit worm. On this ledge is a switch marked "Steam Vent". Hit the switch and get out of harm's way as quick as you can.
The last part is a little tricky. You'll need to make your way to the ledge to the left of the pit worm and turn the pressure valve. The only way there is to use the barnacle to latch on the organic matter above it, swinging perilously in front of the pit worm in the process. Try and hit the worm in the eye, distract him for a moment, and make your move.
Once you open the pressure valve, drop down onto the ledge and get back to the main control room as quick as you can. Head back into the control room, where both the Gearbox and Valve lights should be on. Hit the switch and flush the big fella.
Once the area is cleared, it's possible to climb around and jump to the far walkway from either of the side ledges. However, you can just make your way up the ladders to the main control panel overlooking the area, use the bridge control, and leisurely stroll across into the next episode.
EPISODE 9 - FOXTROT UNIFORM (iNSiDERS)
Another huge episode, Foxtrot Uniform features both great military style-combat as well as horrifying alien encounters underground. Break out the heavy artillery -- you're going to need it!
You start this episode on a catwalk over some water. At the far end is a bullsquid -- kill it at long range and head down to the end.
At the end of the catwalk, turn to the right and find another bullsquid. Kill it and look up -- you'll see some more alien matter growing on the walls. Use the barnacle grapple to pull yourself up to the catwalk and eventually make your way to a ladder going upward. Be prepared to fight.
You'll emerge at a large compound, with Black Ops everywhere, who will immediately begin to lob grenades at you. There is an orange storage in front of you with some heavy machinegun ammo and some satchels. Run in, toss the satchels right in front of the container opening. When the Black Ops come for you, blow them up. You should kill two or three Ops before moving on.
Causing you great distress in the distance is an Ops member manning a turret. Lob a grenade over, and the explosive crates surrounding him will do the rest of the work.
To the left are some stacked storage containers. One of them is open, and provides a makeshift ramp to the next area. Before climbing, try to peek through the crates and snipe the enemies on the other side. If they don't notice you, it's easy, but if they start lobbing grenades, you're in for a bumpy ride.
Once you've cleared the enemies out, smash the crates and grab what you can. Continue and crawl into the small hole at the end. When you emerge, you'll find two friendly troopers, who are having problems with the snipers in the next area.
This next area is -- literally -- a bomb waiting to explode. The entire area is wired with explosive crates and trip mines, and any explosion will send the entire base up in smoke. Be very careful.
As soon as you exit your buddies, look up to the right -- there's a sniper tower there. Lob up an MP5 grenade and take him out. More Ops will come for you, but your squad mates should help. Work your way around the crates to the right, paying mind to the enemies in the towers. More MP5 grenades should do the trick.
See that mesh area up at the top of that building? There's a doorway down below, and at the top is an Op with -- a sniper rifle! Kill the Op, grab the rifle, and prepare to go to work.
Climb back down, and hug the right wall. You should find a pathway unblocked by laser mines. Have your sniper rifle ready.
As soon as you round the corner, two Ops will come gunning for you. Take them out quickly with the sniper rifle. From here, you will need to take about 4 or 5 more Ops, and the sniper rifle is the cleanest way to go. Hug the right wall and slip through the crack in the orange door at the end to the next map.
As you enter the indoor garage area, you'll see a battle going on between the Black Ops and some aliens. back up and let them fight it out for a bit. In the end, you should only have to kill one or two enemies to clear the area out. Next to the truck is a ladder heading downstairs -- prepare yourself for one of the most horrifying battles you'll have in a while.
In the sewers, turn on your night vision and try not to get disoriented. There are a mess of nasty spiders down here, and you'll need every bit of ammo you have to take them out. Move slowly, and try and lure them into traps with satchels, grenades, rockets, the displacer, and anything else you can find. Snarks work especially well down here, remarkably.
If you continually stay to the left, you'll eventually make your way to a wall with a pipe running along the top. This is the exit out of the first nasty area. You'll see a light at the end of the tunnel (really!) Emerge at the ladder leading out of the water, and prepare to do some running.
Once you're out of the water, run to the end of the ledge where aliens are emerging from. Flip the switch, closing the door. Run around to the other side, and flip the other switch, shutting the second door. Now that you've stopped what would otherwise be a never-ending supply of aliens, take the remaining ones out.
Once this area is cleared, break the crates in the corner. Rockets are there, and you'll be glad to have them before heading down the next tunnel.
If you can, lure the huge aliens out of the tunnel, back into the area with the water in it. Once again, use satchels, the displacer, rockets, anything you have to kill the spiders. Once done, head into the tunnels and head left and forward, and you'll arrive in the next map, at the bottom of a grating with a few friendly troops on top.
Stand back while the engineer blowtorches the grate to allow you out. Once you climb up, listen to the squad members as they tell you about the aliens outside, and some standoff at the dam up ahead. At your disposal you now have a soldier, an engineer, and a medic, who will be especially useful.
From here, you have a long battle ahead of you. Outside this little bunker are hordes of aliens, and you'll have to work your way slowly but surely to the end of the map. Start by going left, wrap around the crates and head to the right, and then hug the left wall, mowing down all the enemies you encounter. Drop back regularly to have the medic heal both yourself and your troops if necessary -- just make sure to keep the medic out of harm's way.
From here, make a right and head for the "Secure Access" doors. There's an opening to slip through -- head through with your night vision and head to the next map.
As you move forward, you'll hear sounds of a battle. Look outside and you'll see a few soldiers shooting a Gargantua, who is tied up on the same dam you once crossed in Half-Life as Gordon Freeman. It's obvious this scene takes place at a later time, as the area has taken more damage and alien plant life has begun to grow on the walls.
Power up using the health and HEV stations on the wall, and then get your barnacle grapple ready. Hook onto one of the alien plants on the far wall and pull yourself over. Try and pick a plant over dry land so you don't accidentally fall in the water.
Once you land, kill the aliens attacking your troopers, and then press the plunger at the entrance to the dam. The fuse will light and explode at the Gargantua's feet, blowing him up and opening a huge hole in a pipe below. Drop into the pipe, to the water below, and to the next episode.
EPISODE 10 - THE PACKAGE (iNSiDERS)
You've almost reached the end, and it appears all roads are leading to the same thing -- the imminent destruction of the base. if only you could prevent that somehow...
You start the episode in the same tunnel where you left off. You won't be able to get out via the first grate you pass, but you can sneak through the second one. Climb out of the vent into the small pool of sewage.
Before climbing out onto the beachhead, turn around and look up. Up on a ledge is a dead marine, and a shotgun and ammo, which you can reach by walking around the ledge. Grab the weaponry and continue.
You'll reach two soldiers who are very anxious about the situation at hand. Listen to their story, and follow them as they run off and the music starts. This is one of the most enjoyable sequences in the game -- have fun!
You'll come to another small body of water, and lots of enemy fire. In the distance, a Black Ops member is manning a turret, and can be taken out easily enough with the sniper rifle or grenade. Unfortunately, there are also Black Ops in and under the water (!), and some will surface as you make your way across. Don't just run through, or you and your squadmates will likely get ambushed from behind.
There are some more Black Ops around the downed helicopter in the water. The path you need to take is directly behind it, which will lead you to the end of the map.
Head through the narrow rock clearing and you'll come to another open area. Bad things are about to happen. In the distance, someone is lobbing mortars at you -- stand still, and you (and any troopers you have with you) will be dead quickly. If you can, take out the Black Ops trooper at the cannon with the sniper rifle at the first opportunity -- you'll save yourself a lot of headaches.
Your first goal here is a door to the far rear right of this canyon, under a sign reading "Ordinance Storage Facility". Get to the door (grabbing the rocket launcher next to the crate in the center of the canyon, if you can) along the way and prepare to take out one Black Ops member in the room.
Listen to the radio. A squad member who apparently knows you (he asks "Adrian, is that you?") says his squad is pinned down by a group of Black Ops. They'll open the bunker door for you, which is on the other side of the canyon you entered this room from.
Make your way across to the left side of the canyon, where the bunker doors have been opened. Unfortunately, Black Ops have arrived outside and will make life difficult for you, as will the continuing stream of mortars if the Black Ops member is still manning the cannon.
Once in the bunker doors, you'll find the person who was just on the other end of the radio -- dead. Grab the heavy machinegun ammo and hop on the small box. Hop around the boxes around the perimeter of the room, until you can climb down into the crawl space next to the long red pipe.
At the end of the crawl space, you'll emerge at the bottom of the stairway. Black Ops are all over the place, making it a hazardous climb. At the top of the stairs, you can either go right or left. The right is a small room with all crates, goodies, and black Ops, and to the left are more stairs leading to the roof. Grab what you can and continue.
You'll find yourself on the roof of the building with the cannon. To your left is a huge wall you need to get through. Use the controls on the cannon to lob a mortar at the wall, which will then crumble. Do NOT jump off the roof yet -- a few aliens will arrive on the scene. Take them out from long distance and head through through the now-accessible door, to the end of the map.
As you round the corner, you'll find a huge spider waiting for you. Keep your distance and use whatever you have excess ammo of -- satchels and the alien spider gun are good choices.
After killing the spider, you'll emerge into a rubble-filled base with aliens to your left and right. Take out the alien on the left first -- a chopper circling overhead is about to attack the alien on the right, saving you some trouble.
Turn on your night vision and run across into a small darkened bunker. There's an alien inside to the left - take him out and prepare to battle the helicopter circling above.
Climb up the ramp and wait until you can get a clear shot at the helicopter with the rocket launcher. If you must, retreat into the makeshift bunker, or jump through the crack in the wall and hide in the back of the truck (with the two energy cells) until you have another opening to shoot.
Once you have the helicopter out of the way, make your way past the overturned truck and climb the ladder. Your goal is to get to the roof to the left, but it's too high. There's a cable leading across, but it's currently (no pun intended) electrified. Hop on the vents and make your way across the roof, down the ladder, and under the orange door. In the rubble, there's a door to a small room with a power switch. Flip the switch and head back up to the roof.
With the power off, you can now make your way across the wire to the other side. Head across and run around to the area where there's an open ventilation shaft. Drop down.
You'll drop into a parking garage, with a few aliens lurking about. There's also some heavy machine gun ammo and health in the toll booth. Grab it, pop the aliens, and head down the ramp. You'll meet some more aliens, including another large spider. Frag 'em all.
Across the garage, you'll see another SUV underneath a vent shaft. Beware! As soon as you head that way, Black Ops will drop down on your position. Throw some satchels down and take them out as soon as they hit the ground. If they survive, MP5 'em.
Behind the SUV are a few crates -- break them and grab the goodies. Climb up the SUV into the vent, and talk to the security guard there. Apparently the Black Ops have a bomb, and they're planning on blowing up the base. You haven't got much time. Head around into a dark corner of the vent and into the last map of the episode.
As soon as you leave the vent, you'll be attacked by a few more Black Ops. After killing them, try to open the door that Barney has barricaded himself behind. he's pretty upset, and says he's not opening the door "until someone turns that bomb off!". Fair enough.
To the left is an open gate. Slip through and get your sniper rifle ready. At the far end is a truck, with two Black Ops members chatting...and arming a bomb. If you're quiet, you can snipe the two of them before they even know it. Once that's done, hop on the truck and deactivate the bomb with your "use" key.
Head back around to Barney, who will let you in. Listen as he explains about the Black Ops downstairs. Grab as much ammo as you can, hop on the elevator, and ride down into the last episode.
EPISODE 11 - WORLDS COLLIDE (iNSiDERS)
The last episode in Opposing Force, you'll find yourself first battling endless hordes of Black Ops personnel, and then one of the most badass monsters to grace a PC screen. More than 100 people wrote in looking for help on how to kill the final bass, and you can finally find out how below.
A word of advice: work slow, and smart -- if there's a way to take out large groups of enemies at once, don't miss it.
You start at the bottom of the elevator you were on at the end of the last episode. You're in a huge warehouse, with crates being loaded on a conveyor. Black Ops personnel are everywhere, and it will be hard to snipe the sniper babes, as the usually move too fast. Use the MP5, grenades and satchels if you have them, and start along by hugging the left wall.
After a few moments, get your displacer ready -- you'll find a large group of Ops clustered together. A good shot can take out 6 or 7 of them, and make your life a lot easier.
Continue along the conveyor belt line, cross over at the end and climb up the boxes there. At the far end, you can drop down to the left, towards the beginning of the conveyor. If you time it right, you can duck in and out from alcove to alcove and get to the next area.
After leaving the conveyor area, shoot the Ops above you and ride the elevator platform to your right upward. From there, work your way forward and to the right, until you come to a series of boxes, crates and other assorted items forming a stairway of sorts upward.
Make your way upward, jumping from crate to crate, until you reach the top area. Move to the opening at the right -- slowly -- and peek below. You'll see a huge battle between Ops and aliens going on. Let the battle rage as long as possible without being seen -- it will only make your job easier.
In front of you are a few swinging crates. Jump from crate to crate and work your way across the warehouse room from above. Try and attack any remaining enemies from this lofty position -- it's much easier than trying to stand toe-to-toe with them.
Drop down and open the large door, making sure to eliminate any remaining enemies first -- you want to hear what Barney has to say on the other side.
Once in the warehouse door, shut the door behind you and listen to Barney. Apparently there's a huge alien downstairs, and it's "the nastiest-looking thing yet!" Stock up on all the weapons and ammo you can, and ride down the moving platform to the final epic battle of Opposing Force.
After riding the platform downstairs, you'll arrive at a windy area that seems to be having some trouble with gravity. You'll feel some resistance as you move forward, but it's nothing to be concerned about. Move forward, go down the stairs, and open the door.
This is the scene for your final battle, and there are a few areas of note to keep track of: on one side, a rope you can use to climb to the upper level, and a healing pool in the far corner. The bigger room has two catwalks on either side of a large stage, with mounted guns on each side. Below is a pit you don't want to fall into. Above the left catwalk are some alien plants, which will come in handy indeed. Man the gun on the right catwalk and wait.
Eventually, a BIG fella will come out of the purple portal. It may be a few seconds before you can register the first, but keep aiming for his right eye. When you hit him, the monster will convulse a little. Use this opening to scramble to the left catwalk and man the other cannon.
With the left cannon, shoot the boss' left eye. At this point, the alien will go completely berserk, and a hole in his stomach will open, revealing a purple portal. In a few seconds, a shock trooper will appear from this portal, but before that happens, fire as many shots from the cannon into the heart of the portal.
While this is going on, you'll obviously want to keep clear of the alien's dangerous breath, and the various times he'll take a swing at you. Once the shock trooper appears, run around the catwalk to the rope area, kill the newly spawned shock trooper, and heal yourself up at the pool if necessary.
The key to defeating the boss is to pump as many shots into the alien's portal as possible. You will have to go through the cycle a few times, depending on what skill level you're playing on, but a few things will happen along the way to make this more difficult.
After the first cycle, the alien begins get violent, and the room starts to fall apart. The catwalk connecting the left and right sides of the room collapses, and the ladder leading up to the left cannon breaks as well. Your only alternative at this point is to climb to the right cannon, use the barnacle grapple, and grapple over to the left cannon at the right moment.
I eventually found a cycle that worked well for me: grapple to the left cannon, shoot the left eye; jump down, climb the rope, heal; run to the right cannon, shoot the right eye; shoot the portal repeatedly when the alien's stomach opens; kill the shock trooper that teleports out.
Depending on how accurate you are with the cannons, you may have to repeat this cycle a LOT -- 10 times or more is not out of the question. However, keep pounding away at the heart of the portal when you can, healing yourself as often as needed, and you'll eventually beat the big guy. Watch as the alien retreats into the portal, and enjoy the game's concluding cinematic.
Congratulations! You've just finished Half-Life: Opposing Force!
iNSiDERS (2000) 00-03-26
Through the door, you'll find another small lift. Take it up and you'll run into a room with a few aliens. To the right are large doors leading to an elevator leading upstairs; to the left are some stairs leading to a door and another hallway filled with crates (and goodies). You can take the elevator if you want, but it's basically a dead end with ammo and health to be found. Make your way to the hallway via the door to the left, and outside to yet another habitat.
This habitat contains two large tentacle creatures that you really don't want to deal with. Use grenades to distract the creatures, and then walk quietly (they track sound) around the ledge until you're out of harm's way. Look up and you'll see a hole in the wall where a few more alien plants are growing. Use the barnacle grapple to hoist yourself up and into the vent.
Make your way through the vent and to a small room where you'll find a small radio. Listen to the message and then throw the power switch next to it. This will stop a fan blocking the vent exiting the room. Smash the vent, climb in, and continue until you fall into the next episode.