Several secondary gameplay modes (Danger, Lucky, and Palace) are also triggered at key points in the vertical-scrolling mode. All of the secondary modes are side-scrolling shooters. The Danger stage requires you to face a gauntlet of enemies, while the Lucky stage is full of powerups, game continues, and other bonuses. The Palace stage is triggered when you defeat a mini-boss; you must get past the palace defenses before you can face the end-of-stage boss.