Single Player Cheats
These cheats work for single player games (i.e. not Xbox Live). Press START and tap the D-Pad for:
Low Gravity:
Up, Right, Right, Up, Up, Left

No Target Mode:
Left, Right, Right, Left, Up, Down
IFF Glow:
Right, Right, Right, Up, Down, Left
Big Heads:
Up, Up, Left, Right, Up, Down
Player Clipping:
Up, Down, Left, Right, Down, Up
Auto-aim Toggle:
Down, Down, Down, Down, Up, Up

Add 16,000 Credits:
Up, Up, Down, Down, Left, Right

Outfit Change:
Left, Right, Down, Up, Left, Right
Alternate Costume
Pause the game and press the following combination:
Left, Right, Down, Up, Left, Right
Identify Friends or Foes
Pause the game and press the following combination:
Right, Right, Right, Up, Down, Left
Low Gravity
Pause the game and press the following combination:
Up, Right, Right, Up, Up, Left
Not Targeted by Enemies
Pause the game and press the following combination:
Left, Right, Right, Left, Up, Down
Toggle Auto-aim
Pause the game and press the following combination:
Down, Down, Down, Down, Up, Up
Note: The above codes cannot be enabled in XBox Live! sessions.