Challenge Rooms:Unlock the following challenge rooms at the “Challenge Room” menu by entering the corresponding sequences of buttons at the “Press Start” screen:CHALLENGE ROOM – CODEArron Sedillo challenge room – Right, Down, Left, Up, LB, RB, Y(2), A(2), Start.EuroGamer challenge room – Down, Up, Down, Up, Left, LB, X, LB, X, Y, Start.GamesRadar challenge room – RB, Y, X(2), Up, Down, LB(2), Up, Down, Start.IGN challenge room – Up, Down, Y, X(2), Y, Down, Up, LB(2), Start.Major Nelson challenge room – LB, X(3), Right, Down, LB, Left, Y, Down, Start.Super Hard difficulty:To unlock Super Hard difficulty, complete the game. Invincibility:To become invincible, press the Xbox 360 button and then press Back. Resume playing from the Dashboard menu. The game should remain paused and you will still be in motion, but cannot receive damage. This can be useful if executed in the middle of an attack where you are likely to receive damage.Achievements:ACHIEVEMENT – HOW TO UNLOCKMeet with annihilation (20 points) – Kill all foot soldiers and enemy trucks on a Meet With Enemy sequence.The Emperor