checked-no =>Big Head Mode: Pause the game, hold [R] and press Yx4. Release, then hold [L] and press Yx2. Release, hold [R]+[L] and press Y X Y. =>Upgrade Sword: Pause the game, hold [L]+[R] and press X B X Y Y B X B. =>Complete Current Mission: Pause the game, hold [R] and press Bx3 X. Release, hold [L] and press Y Y. Release, hold [R] and press B B. This only works in the standard mission modes, not the special red coin or find enemy modes. =>Battle Arena: To unlock the Battle Arena on Robot Beach, you'll need to receive all the 64 of the normal and master grades.