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2. MacMahon Squares - Wikipedia

   en.wikipedia.org/wiki/MacMahon_Squares

   Another way to change the puzzle is to restrict which colors squared make up the border colors. In the classic MacMahon squares puzzle, there are a total of 20 places on the border. [1] The number of each color that can be present on these 20 places can be described by B a,b,c [1] where a, b, and c are the number of each color of the border pieces.

3. List of impossible puzzles - Wikipedia

   en.wikipedia.org/wiki/List_of_impossible_puzzles

   This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. Kookrooster maken 23; 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions.

4. 15 puzzle - Wikipedia

   en.wikipedia.org/wiki/15_puzzle

   Named after the number of tiles in the frame, the 15 puzzle may also be called a "16 puzzle", alluding to its total tile capacity. Similar names are used for different sized variants of the 15 puzzle, such as the 8 puzzle, which has 8 tiles in a 3×3 frame. The n puzzle is a classical problem for modeling algorithms involving heuristics.

5. Play Simply Jigsaw Online for Free - AOL.com

   www.aol.com/games/play/masque-publishing/simply...

   Piece together a new jigsaw puzzle every day, complete with themes that follow the seasons and a super useful edges-only tool. Play Simply Jigsaw Online for Free - AOL.com Skip to main content

6. 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.

7. Logic puzzle - Wikipedia

   en.wikipedia.org/wiki/Logic_puzzle

   Another form of logic puzzle, popular among puzzle enthusiasts and available in magazines dedicated to the subject, is a format in which the set-up to a scenario is given, as well as the object (for example, determine who brought what dog to a dog show, and what breed each dog was), certain clues are given ("neither Misty nor Rex is the German Shepherd"), and then the reader fills out a matrix ...