Oni

Open the persist.dat file in the Oni folder with a Hex Editor. Find the 0x44 offset, which value is 02. Overwrite it to 07. In game, press F1, and simply type in the codes. If you type them again it will switch off the codes.

liveforever - Invulnerability
moonshadow - Cloak all the time, except movies
superammo - Unlimited weapon ammo
roughjustice- All weapon fires INCREDIBLE fast
chenille - Daodan overpower mode all time
behemoth - Makes you big
minime - Makes you small
shapeshifter- Let you switching characters with F8
elderrune - Regenerates you over time
fatloot - Hypospray + ammo
munitionfrenzy- Gives you some weapon...
reservoirdogs- Enemies fight with each other

Once in the game, press F1. This will bring up the Diary screen. Type in the cheat you want to activate it:

liveforever - God mode
canttouchthis - Can't be knocked down or knocked back

Typing in the cheat again from the Diary screen will turn that cheat off.

Once in the game, press F1. This will bring up the Diary screen. Type in the cheat you want to activate it:

winlevel - Instantly Win Level
loselevel - Instantly Lose Level

Typing in the cheat again from the Diary screen will turn that cheat off.

Once in the game, press F1. This will bring up the Diary screen. Type in the cheat you want to activate it:

elderrune - Regenerate health over time

Typing in the cheat again from the Diary screen will turn that cheat off.

Press [Crtl]-[Shift]-[Y] to display your frame rate on the screen.