Rainbow Six Codes -

Clodhopper mode:
Press Analog-stick Left + D-pad Down + B during game play to toggle clam pincer hands.

Rudeness mode:
Press Analog-stick Down + D-pad Down + B during game play to toggle instant death for anyone near you. Note: If you have the "Team God On" code enabled your men will keep repeating "Watch you fire!".

Victory conditions:
Press Analog-stick Up + D-pad Down + B during game play to toggle the victory conditions. This will prevent the mission from being lost if you trigger an alarm or the terrorists shoot the hostages.

Team God mode:
Press Analog-stick Left + D-pad Down + A during game play to toggle invincibility for your entire team.

Avatar God mode:
Press Analog-stick Up + D-pad Down + A during game play to toggle invincibility for your character while leaving the remaining members of your team normal.

Heavy breathing mode:
Press Analog-stick Down + D-pad Down + A during game play to toggle heavy breathing mode.

Mega head mode:
Press Analog-stick Left + D-pad Down + X during game play to toggle mega head mode.

Big head mode:
Press Analog-stick Up + D-pad Down + X during game play to toggle big head mode.

Stumpy mode:
Press Analog-stick Left + D-pad Down + Y during game play to toggle stumpy mode.

Side scroller mode:
Press Analog-stick Down + D-pad Down + Y during game play to toggle becoming thin as the trees.

Brains:
Press Analog-stick Up + D-pad Down + Y during game play to toggle the AI of your team.

Polska mode:
Press Analog-stick Down + D-pad Down + X during game play to change the faces of your team.

Hint: Finding terrorists:
Always check your radar for terrorists before entering a room. Terrorists turn red arrows on radar.

Hint: Heartbeat sensor:
Do not leave without a heartbeat sensor -- let one operative have at least one.

Glitch: Save ammunition:
If you do not use an entire clip but are low, change your clip. The game will not use up one of your extra clips, but instead simply reload your clip in use. Note: This may not work for pistols.