Cheats

Level Skip:

Light a flare,
using the WALK key, take one step forwards,
using the WALK key, take one step backwards,
turn around 3 times (3x360 degree in any direction),
immediately do a forward jump.

All Weapons and Ammo (+ Medi Packs and Flares):

Light a flare,
using the WALK key, take one step forwards,
using the WALK key, take one step backwards,
turn around 3 times (3x360 degree in any direction),
immediately do a backflip.