Amped 3 (Xbox 360)

Cheat mode:
Select "Options" at the main menu, then choose the "Cheat Codes" option. Enter one of the following codes at the "Cheat Codes" screen to activate the corresponding cheat function.

All sleds:
Press R, X, L, Down, Right, LB, L, R, Y, X at the cheat codes screen.

Full awesome meter:
Press Up, R, X, Y, LB, X, Down, LB, R, RB at the cheat codes screen.

Unknown Effect:
Enter Up, Up, Down, Down, Left, Right, Left, Right, X, Y at the cheat codes screen.