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Stackle is a very popular online physics game where the developers have inculcated the tower building concepts but with some very interesting distinctions. In this rather colorful game, the gamer must stack as many blocks on top of the tower as possible. However, there are chances for the whole arrangements to topple and that is not what you would like to end up doing. This game does appear to be easy and colorful but as a matter of fact, you as a gamer will need to analyze the physics associated with the game and make each move very tactfully.