Note : u can't enter the magically contaminated area w/o the magic stone.
Dig with shovel in dessert twice -> dirt shovel & key.
Make lever with plank & fulcrum. Drop lever & push it to raise concrete rubble. Dig with dirt shovel in dirt -> parchment. Look parchment.
Go west of dome with device & push five & push four -> west of domed city.
Go hall -> lamp. Unlock manhole cover with key. Go right down -> donut. Look magic items -> wand.
Go east end. Push 5,3. Look rock -> magic stone. Push 5,4.
Go west end. Push 5,3. Go magically contaminated area. Recharge wand. Look at drawbridge -> donut picture. Throw donut at picture -> e. Look toilet -> d -> explosive.
Go back to domed city & find tower. Climb tower. Drop explosive. Wave wand -> u -> Laser cutter.
Go back to castle & find steel door. Use laser cutter to cut open door. Look console. Push black then red.