Enter the following cheats for the desired effect:

remgamma - Remove gamma on the level
stwnn - Complete level successfully
cheath - Gives 1000 hp
st1 - Gives 15000 hp
st2 - Invincibility
stammo - Gives some ammo
ammomax - Maximum ammo
allweapons - Every weapon
stexp or cheatexp - Adds enough ex for getting new level
cheats - + 50 to the speed skill
cheatw - + 100 skills of weapons reloading
stkk - To kill all monsters withing radius of 1000 pixels from the character
stk9 - To kill all monsters on the map
stgod - Makes all skills (except perk) 100 or 200 sequential, adds 50000 money
stm or cheatm - + 10 000 money
stshop - Download shop on the level
stmus[x] - Turn the x number of tracks
stmusstop - Stop current track
stat - Turn onoff current statistics