 The original Japanese version employs a mechanism where the difficulty will max out.Getting hit by enemy fire will result in losing a live and once all lives are lost, the game is over unless players insert more credits into the arcade machine to continue playing.Although there is an ending, the game loops back to the first stage after completing the last stage as with previous shoot 'em ups from Toaplan and each loop increases in difficulty, however reaching the fifth loop results in a kill screen that crashes the arcade hardware.