This is an alternative version of classical Puzzle Bobble game. There's a guy who operates a machine that produces iron balls of different colors. The balls are placed in the top part of the screen. You shoot balls from the bottom. Your goal is to shoot the balls the way they will form groups of 3 or more identical balls. These groups will be eliminated. If you clear all the balls at the top, you pass the level. If you can't do it, you'll pass the level anyway if you eliminate a certain number of balls.
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