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2. Missing square puzzle - Wikipedia

   en.wikipedia.org/wiki/Missing_square_puzzle

   The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

3. Tetrad (geometry puzzle) - Wikipedia

   en.wikipedia.org/wiki/Tetrad_(geometry_puzzle)

   In geometry, a tetrad is a set of four simply connected disjoint planar regions in the plane, each pair sharing a finite portion of common boundary. It was named by Michael R. W. Buckley in 1975 in the Journal of Recreational Mathematics.

4. Vanishing puzzle - Wikipedia

   en.wikipedia.org/wiki/Vanishing_puzzle

   The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

5. These 3D Brain Teaser Puzzles Require Logic and Geometry for ...

   www.aol.com/lifestyle/3d-brain-teaser-puzzles...

   The best 3D brain teaser puzzles require logic and spatial awareness to make an exciting game of skill. ... (which involve pulling apart and putting together geometric shapes via turning, clicking ...

6. Ostomachion - Wikipedia

   en.wikipedia.org/wiki/Ostomachion

   The Ostomachion which he describes was a puzzle similar to tangrams and was played perhaps by several persons with pieces made of bone. [5] It is not known which is older, Archimedes' geometrical investigation of the figure, or the game. Victorinus, [6] Bassus [7] Ennodius [8] and Lucretius [9] have also discussed the game.

7. Free Online Games: Play board games, card games, casino games ...

   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

8. Hoffman's packing puzzle - Wikipedia

   en.wikipedia.org/wiki/Hoffman's_packing_puzzle

   Hoffman's packing puzzle is an assembly puzzle named after Dean G. Hoffman, who described it in 1978. [1] The puzzle consists of 27 identical rectangular cuboids, each of whose edges have three different lengths. Its goal is to assemble them all to fit within a cube whose edge length is the sum of the three lengths.

9. n-dimensional sequential move puzzle - Wikipedia

   en.wikipedia.org/wiki/N-dimensional_sequential...

   2-cube 3×3 virtual puzzle Geometric shape: square. A 2-D Rubik type puzzle can no more be physically constructed than a 4-D one can. [8] A 3-D puzzle could be constructed with no stickers on the third dimension which would then behave as a 2-D puzzle but the true implementation of the puzzle remains in the virtual world.