ALIAH           Invulnerability toggle
FATAL           All weapons and ammo

Use these codes to warp to that level:
LAVA2           Mission 1 stage 2
LAVA3           Mission 1 stage 3
GATE1           Mission 2 stage 1
GATE2           Mission 2 stage 2
GATE3           Mission 2 stage 3
CROC1           Mission 3 stage 1
CROC2           Mission 3 stage 2
CROC3           Mission 3 stage 3
HEAT1           Mission 4 stage 1
HEAT2           Mission 4 stage 2
HEAT3           Mission 4 stage 3