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Bring up the cheat console by hitting ~ (or the key above Tab) and type
"sv_cheats 1" enable cheats.
Enter the following cheats for the desired effect:
Cheat Result
giveall - Give all weapons.
god - God mode.
host_timescale 0.1 - Bullet time/Slowmotion.
host_timescale 1 - Normal speed.
notarget - Enemies ignore you.
noclip - Fly.
buddha - Invincibility.
"sv_cheats 1" enable cheats.
Enter the following cheats for the desired effect:
Cheat Result
giveall - Give all weapons.
god - God mode.
host_timescale 0.1 - Bullet time/Slowmotion.
host_timescale 1 - Normal speed.
notarget - Enemies ignore you.
noclip - Fly.
buddha - Invincibility.