Rogue Trooper Cheats
Finish 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.
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.
Finish the game under any difficulty setting . Start a new game and the new "Massacre" difficulty option will be unlocked.
All weapons and upgrades
Finish 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.
Kill an N.T.A.
To easily kill a N.T.A, duck behind a box, and blind fire it (press X to blind fire). This will force the N.T.A. to slowly turn around then rappidly fire at it back.