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OOG: The Object Orientation Game

This is a computer version of Tangram. Tangram is an ancient Chinese puzzle with just a few geometric shapes (to be exact, one square, one parallelogram and five triangles of varied sizes). Move and rotate these pieces to build a goal shape (squares, polygons, profiles,...). The program has dozens of pre-made goals, but you can create and save your own. If you are stuck, the program can help you by placing a piece of your choice in the correct position.