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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. These 88 Comparisons Reveal The Unexpected Diversities Of ...

   www.aol.com/lifestyle/88-interesting-side-side...

   From a playful puppy growing up to the changing seasons in a park, these comparison pics show how magical the world can be when we take a closer look. The post These 88 Comparisons Reveal The ...

4. Jigsaw puzzle - Wikipedia

   en.wikipedia.org/wiki/Jigsaw_puzzle

   A few puzzles are double-sided so they can be solved from either side—adding complexity, as the enthusiast must determine if they are looking at the right side of each piece. "Family puzzles" of 100–550 pieces use an assortment of small, medium and large pieces, with each size going in one direction or towards the middle of the puzzle.

5. Edge-matching puzzle - Wikipedia

   en.wikipedia.org/wiki/Edge-matching_puzzle

   Edge-matching puzzle. An edge-matching puzzle is a type of tiling puzzle involving tiling an area with (typically regular) polygons whose edges are distinguished with colours or patterns, in such a way that the edges of adjacent tiles match. Edge-matching puzzles are known to be NP-complete, and capable of conversion to and from equivalent ...

6. Sliding puzzle - Wikipedia

   en.wikipedia.org/wiki/Sliding_puzzle

   e. A sliding puzzle, sliding block puzzle, or sliding tile puzzle is a combination puzzle that challenges a player to slide (frequently flat) pieces along certain routes (usually on a board) to establish a certain end-configuration. The pieces to be moved may consist of simple shapes, or they may be imprinted with colours, patterns, sections of ...

7. Combination puzzle - Wikipedia

   en.wikipedia.org/wiki/Combination_puzzle

   A combination puzzle, also known as a sequential move puzzle, is a puzzle which consists of a set of pieces which can be manipulated into different combinations by a group of operations. Many such puzzles are mechanical puzzles of polyhedral shape , consisting of multiple layers of pieces along each axis which can rotate independently of each ...