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2. Missing square puzzle - Wikipedia

   en.wikipedia.org/wiki/Missing_square_puzzle

   Note the grid point where the red and blue triangles in the lower image meet (5 squares to the right and two units up from the lower left corner of the combined figure), and compare it to the same point on the other figure; the edge is slightly under the mark in the upper image, but goes through it in the lower.

3. List of impossible puzzles - Wikipedia

   en.wikipedia.org/wiki/List_of_impossible_puzzles

   Coloring the edges of the Petersen graph with three colors. [5] Seven Bridges of Königsberg – Walk through a city while crossing each of seven bridges exactly once. [6] Squaring the circle, the impossible problem of constructing a square with the same area as a given circle, using only a compass and straightedge. [7]

4. Mutilated chessboard problem - Wikipedia

   en.wikipedia.org/wiki/Mutilated_chessboard_problem

   The mutilated chessboard problem itself was proposed by philosopher Max Black in his book Critical Thinking (1946), with a hint at the coloring-based solution to its impossibility. [ 3 ] [ 4 ] It was popularized in the 1950s through later discussions by Solomon W. Golomb (1954), [ 5 ] George Gamow and Marvin Stern (1958), [ 6 ] Claude Berge ...

5. Free Online Games: Play board games, card games, casino ... - AOL

   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.

6. These 3D Brain Teaser Puzzles Require Logic and ... - AOL

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

   There are also a few pages of 3D puzzles, which involve stacking play pieces on top of each other. Educational Insights claims Kanoodle expands spatial reasoning skills and enhances critical thinking.

7. Word search - Wikipedia

   en.wikipedia.org/wiki/Word_search

   A word search, word find, word seek, word sleuth or mystery word puzzle is a word game that consists of the letters of words placed in a grid, which usually has a rectangular or square shape. The objective of this puzzle is to find and mark all the words hidden inside the box.

8. Nonogram - Wikipedia

   en.wikipedia.org/wiki/Nonogram

   A completed nonogram of the letter "W" from the Wikipedia logo. Nonograms, also known as Hanjie, Paint by Numbers, Picross, Griddlers, and Pic-a-Pix, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the edges of the grid to reveal a hidden picture.

9. List of maze video games - Wikipedia

   en.wikipedia.org/wiki/List_of_maze_video_games

   In grid capture games, also called line coloring games, the maze consists of lines, and the goal is to capture rectangular areas by traversing their perimeters. The gameplay is not fundamentally different from Pac-Man (players still have to navigate the entire maze to complete a level) but enough games have used the grid motif that it is a ...