Type jump<level name>, using ragnarok, oasis, anubis, juggernaut, and dead as level names.

Activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Invincibility - macleod
Armor, health, ammo - keymaster
Unlimited ammo - dirtyharry
Glider wings - buzz
Display framerate - framerate
Press F11 and F12 to spy - phantom
Toggle character's sex - snipsnip
Reset at starting position - gohome
Invisibility - sneakers
View all enemies on radar - thrasher
Toggle timer - timewarp
Camera follows ammo - weaponcam
"Singletrac Rules!" message - singletrac
Toggle sounds - bigears
Full map - showall
More weapons - baumer
Unknown - derek7
Unknown - warpme
Unknown - bigbrother
Unknown - nocd