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Balls are planning to sink your submarine. As they spiral towards you, you will have to fight them off by shooting similar coloured balls into the string. When you create a segment of three or more balls of the same colour, it will collapse. When you have eliminated all the balls, you will advance to the next level.
How to play:
Aim your sub by moving the mouse. Switch the color of the ball by pressing space. Left-click to shoot the ball.