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Christmas Stacker features 21 unique levels that you need to unlock to play by successfully completing the preceding levels. The online physics game is rightly named Christmas Stacker because that is exactly what you as a gamer will need to do here in this particular online game. In the various levels of the game, there are various presents and gifts of different shapes that needs to be properly placed on the screen without letting them fall off. The only control required to play this game is the computer mouse. The sequence in which the shapes come are flashed on the top of the screen and you need to pre-plan your every move to attain success.