two levels , each level has has other level to explain how to play , in the first level try to survive your self when you travel to Mars and comeback to earth , in the second level learn every things about SolarSystem and click link's button to visit Nasa website .
two levels , each level has has other level to explain how to play , in the first level try to survive your self when you travel to Mars and comeback to earth , in the second level learn every things about SolarSystem and click link's button to visit Nasa website .
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