It is based on physics engine and have a nice graphics.The objective of the game is to remove unnecessary blocks and to land Alien on teleportation block. If all this done you can teleport the Alien.It has 90 levels, many blocks types. All 90 levels divided into 3 worlds (constellations) which has different graphics on background. Constellations are appears in main menu during progress of game. Then you can choose any level by pressing planet in those constellations.