Various cheats
     Start  game  as  usual,  in  game - bring up the console with [~]
(tilde) and enter the following codes (NOT CaSe SeNsItIvE):

Cheat code:             Result:
NITRO GOD               toggle 'godmode'
NITRO GIVEALL           toggle 'all weapons & ammo'
NITRO GIVEMONEY         toggle 'get 999,999 cash'
NITRO KILLALL           toggle 'kill all enemies instantly'
NITRO FLY               toggle 'flymode' (fly above surface)
NITRO GHOST             toggle 'ghostmode' (fly above & beneath surface)
NITRO REFRESH           refresh health
NITRO CHANGELEVEL       advance to next level
NITRO SPEED X           X equals movement speed 1 (normal) to 10 (fast)