To use these cheat codes, press "Talk" while the game play and thus pause the game. Now you can type one of the following codes to enable the corresponding cheat function:
corresponding cheat function: notarget: invisibility
god: god mode
ammo: full ammo
armor: full armor
health: full health
guns: all weapons
kfa: all weapons, full ammo, armor and health
tears: all weapons and infinite ammo
gear: increase health
poltergeist: ghost mode
maphole: go to the next level
gimmegun pistol: get pistol
gimmegun dual pistols: dual pistols
gimmegun submachinegun: get SMG
gimmegun shotgun: get shotgun
gimmegun assault rifle: get assault rifle
gimmegun semi-auto rifle: get semi-auto rifle
gimmegun nail gun: get nailgun
gimmegun cannon: get cannon
gimmegun plasma weapon: get plasma railgun
gimmegun missile launcher: get missile launcher
gimmegun frag grenade: get frag grenade
gimmegun proximity: get trip bomb
gimmegun remote charge: get pipe bomb