Full health...
	Stage Select...
	Various Achievements...

Note: This code may longer work after the latest game update. Press Start to pause game play on Xbox Live when you are low on health. Rotate the D-pad in a full circle at least three times. Select the "Achievements" option at the menu. Press B to exit that screen. Select the "Resume Game" option. You will still remain at the same screen. Select "Resume Game" again. The game will begin with your character at full health.

Alternately, press Start to pause game play on Xbox Live when you are low on health. Press Xbox Logo to enter the Dashboard menu. Press Xbox Logo again to exit the menu, then resume the game.

To unlock the ability to select any stage you want to play on at any given time, complete the game once through in its entirety.

Complete the following achievements to unlock Xbox Live Gamerscore points.

Unlockable	How to Unlock
Armored Attack (6 GP)	Get in the tank with two other players.
Brasso (10 GP)	Achieve the 12X score multiplier.
Combined Assault (40 GP)	Complete the game with at least one other player.
Freedom (25 GP)	Free 25 POWs.
Hero (10 GP)	Achieve the 24X score multiplier.
Humanitarian (10 GP)	Rescue all of the POWs in the game.
Madman (30 GP)	Attain a 24X score multiplier on every level.
Mercenary (15 GP)	Complete the game on Suicide Mission difficulty.
One Man Army (7 GP)	Kill 200 enemies.
Reckless Driver (20 GP)	Kill 40 enemies while in a vehicle.
Sleuth (20 GP)	Find all of the Secret Areas in the game.
Veteran (7 GP)	Complete the game on Black Ops difficulty.