Rogue Trooper

Unlimited supplies:
Press Back, R, L, Back, click Right Analog-stick, press L at the "Extra" menu.

Unlimited health:
Press Left, Right, Up, Down, click Left Analog-stick, X at the "Extra" menu.

Hippy blood:
Press White, Right, B, Down, R, Back at the "Extra" menu.

Extreme ragdoll:
Press Up(3), Black(3), Up at the "Extra" menu.

Low gravity ragdoll:
Press X(3), B(3), Up, Down at the "Extra" menu.

Completion bonuses:
Successfully complete the game under any difficulty setting. Start a new game, enter the "Options" menu, then select "Cheats". The following cheat options may now be activated.

Low Gravity Ragdoll: Enemies will fly away when killed. Put them on orbit by destroying their oxygen tank.

Extreme Ragdoll

Hippy Blood: Changes spilled blood into colorful flowers.

Level select:
Play any level and complete it. Then, quit the game and restart it. The level you just completed will now be unlocked at the "Cheats" menu.
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All weapons and upgrades:
Successfully complete the game. Instead of starting a new game, use the level select cheat and start on the first level. You will keep all your weapons and upgrades from the last game.

Extreme difficulty:
Successfully complete the game under any difficulty setting . Start a new game and the new "Massacre" difficulty option will be unlocked.