Cheats for turok on Xbox 360?

Spawn a T-Rex in multiplayer: Really kind of hard, hold down RB+LB, then at the same time press down the two control sticks, let go of LB and the left stick, then the RB and right stick. Then wait ten seconds and press in this order Y X B B A X Y A B X once that is all entered hit start, when you unpause a T-rex should have spawned somewhere in the map, and you will here it roar.