In the game choose Story mode or VS mode. A story mode, we can choose Single player; Double players or Three players. Players need to successfully rescue three kittens in each level to win. The shield can be used in story mode. The shield can gain a brief invincible effect. Players need to buy the shield in the store in advance. Higher hp of the enemy at the story mode in the mystery forest deeper. It is suggested that upgrade the bullet power before to enter the deeper level. When the bullet power is max, its power will be quite amazing.