While playing the game you must save the snakes out of the room. But the only way out, is 
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threw  the red gate. On each level of the game you can must save a different number of 
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snakes. When you succed in this you advance on the next level. 
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Also you can bite threw yourself. By doing this you have more snackes  and get more points.
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When you have 4 snakes, you have to use your mouse, to select the one you want to control. 
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Also, the more snakes you have, the more points you get.