To activate the following cheats you must press Esc during game play to pause the game. While paused press and hold Left Ctrl, Left Shift, and Left Alt then enter the numbers using the number pad.
Effect - Numeric Code
Restore Health - 7 7 5 5
Perfect Mode - 5 9 6 4
Always Devastating - 6 8 6 9
All Upgrades - 8 9 6 7
Infinite Missiles - 7 7 9
Invulnerable - 7 5 7 8
Target Indicator Mode - 9 5 8 7
Unlock Four-Hit Combo For Aragorn:
Pause the game and enter 8, 7, 6, 9.