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  2. Nonogram - Wikipedia

    en.wikipedia.org/wiki/Nonogram

    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. In this puzzle, the numbers are a form of discrete tomography that measures how many unbroken lines of ...

  3. No-three-in-line problem - Wikipedia

    en.wikipedia.org/wiki/No-three-in-line_problem

    A set of 20 points in a 10 × 10 grid, with no three points in a line. The no-three-in-line problem in discrete geometry asks how many points can be placed in the grid so that no three points lie on the same line.

  4. 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 ...

  5. Polybius square - Wikipedia

    en.wikipedia.org/wiki/Polybius_square

    A 6 × 6 grid is also usually used for the Cyrillic alphabet (the most common variant has 33 letters, but some have up to 37) [citation needed] or Japanese hiragana (see cryptography in Japan). A key could be used to reorder the alphabet in the square, with the letters (without duplicates) of the key being placed at the beginning and the ...

  6. Play free online Puzzle games and chat with others in real-time and with NO downloads and NOTHING to install.

  7. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    Animation of the missing square puzzle, showing the two arrangements of the pieces and the "missing" square Both "total triangles" are in a perfect 13×5 grid; and both the "component triangles", the blue in a 5×2 grid and the red in an 8×3 grid. The missing square puzzle is an optical illusion used in mathematics classes to help students ...

  8. Off the Grid: Sally breaks down USA TODAY's daily ... - AOL

    www.aol.com/off-grid-sally-breaks-down-050039480...

    Explore daily insights on the USA TODAY crossword puzzle by Sally Hoelscher. Uncover expert takes and answers in our crossword blog.

  9. File:Grid square count puzzle.svg - Wikipedia

    en.wikipedia.org/wiki/File:Grid_square_count...

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