Savage Skies All creatures: Press Left, Right, Left(2), Right, X at the main menu. All multi-player levels: Press Left, Right, Left, Right, Up, Left, Right, X at the main menu. Invincibility: Press Start to pause game play, then press Left(2), Right(2), Up(2), X. Mark all objectives complete: Press Start to pause game play, then press Left, Right(2), Down, Up, Down, Down, X. Crystal: Press Start to pause game play, then press Left, Right, Left, Up, Right, Down, Left, X(2).