Unlock ALL Weapons and Limited Invulnerability:
Press Ctrl and R, E, N.

Unlock Level Select:
Hold Alt-L and type the Episode number (1-4) and Level number (1-5). For example, to skip to Episode 3, level 4, press Alt-L-3-4.

Recharge:
To recharge your energy and 0 your score press B + I + G simultaneously.

Skip Introduction:
When starting the game add 'SKIP' to the command line.

Teleport to any Location on Current Level:
Hold Alt - = and type in coordinates. See the next code for format.

View Coordinates:
Press Ctrl - Alt - Right Shift - F12. Use this cheat to return to this location later via Teleport.