 If a memory card is present, the player is allowed to save their progress and resume the last stage the game is saved at.As with many earlier games released by SNK, it is well known for its high difficulty.All of the levels in the game have doors that can be opened by pressing up on the joystick, leading to rooms that can either benefit or harm the player and finding the correct door will lead the player to the miniboss of the level, while in the AES version these also act as checkpoints.