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Tangram is a popular put-together puzzle. The object of the game is to form a given shape using all seven pieces (tans). Tangram is widely used when teaching spatial concepts in geometry. Tangram develops logical thinking and spatial imagination, and it is a great game for coffee breaks. Tangram by Gemini Puzzles has a large collection of 1000 best Tangram puzzles. The full version also has all puzzles and solutions in PDF format to print out.
