checked-no =>Sound Test: On the options screen, hold [L]+[R]+X+A and press [START]. =>Stage Skip: While playing, pause and press R L D R A [START] to skip to the next stage. =>Invincibility: Pause and press [L]x3 [R]x3 [L]x3 [START]. =>See Ending: Pause the game and press R L D R B [START]. Music will play. =>Super Guns: On the options menu, hold [L]+[R]+A+Y+B+X and press [START].