Press escape (ESC) during game play and
enter your which ever code you want.
You won't get any confirmation that anything has been enabled.
Cheat  Effect 
遊戲中按ESC回到設定畫面.輸入以下作弊碼.再回到遊戲~
IFGDGUN   -     Gives you a pistol. 
IFMDAMAGE -  (Didn't seem to do much when I tried however
                         it's supposed to increase damage.)
IFDAURA  -      Change aura to infernal. 
IFUAMMO   -     Full ammo including grenades and mines. 
IFGPLASMA -   Gives you a plasma gun.

IFUAMMO 无限子弹

IFGPLASMA   给予激光枪(威力极大)

IFGDGUN 给予手枪

付送一个多数人最想要的:IFUMANA 无限的MANA