Haunted Mansion, The Cheat Codes for XBox

Level select:
Hold Right, then press B(2), X, Y(2), X, B, A during game play.

Full health:
When low on health, save then quit the game. Reload the saved game to resume with your health restored.

Invincibility:
Hold Right, then press X, B(3), X, B, Y, A during game play.

Weapon upgrade:
Hold Right, then press X(2), Y(2), B(3), A during game play.