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  2. 24 (puzzle) - Wikipedia

    en.wikipedia.org/wiki/24_(puzzle)

    The 24 puzzle is an arithmetical puzzle in which the objective is to find a way to manipulate four integers so that the end result is 24. For example, for the numbers 4, 7, 8, 8, a possible solution is ( 7 − ( 8 ÷ 8 ) ) × 4 = 24 {\displaystyle (7-(8\div 8))\times 4=24} .

  3. Dots and boxes - Wikipedia

    en.wikipedia.org/wiki/Dots_and_Boxes

    Dots and boxes is a pencil-and-paper game for two players (sometimes more). It was first published in the 19th century by French mathematician Édouard Lucas, who called it la pipopipette. [1] It has gone by many other names, [2] including dots and dashes, game of dots, [3] dot to dot grid, [4] boxes, [5] and pigs in a pen. [6]

  4. Exact cover - Wikipedia

    en.wikipedia.org/wiki/Exact_cover

    The exact cover problem is NP-complete [3] and is one of Karp's 21 NP-complete problems. [4] It is NP-complete even when each subset in S contains exactly three elements; this restricted problem is known as exact cover by 3-sets, often abbreviated X3C. [3] Knuth's Algorithm X is an algorithm that finds all solutions to an exact cover problem.

  5. Edge-matching puzzle - Wikipedia

    en.wikipedia.org/wiki/Edge-matching_puzzle

    TetraVex is a computer game that presents the player with a square grid and a collection of tiles, by default nine square tiles for a 3×3 grid. Each tile has four single-digit numbers, one on each edge. The objective of the game is to place the tiles into the grid in the proper position, completing this puzzle as quickly as possible.

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

    www.aol.com/off-grid-sally-breaks-down-060023168...

    The black squares in the middle of the grid form an interesting pattern reminiscent of stairs. Thank you, Lynn, for this enjoyable puzzle. For more on USA TODAY’s Crossword Puzzles

  7. TDC Games - Wikipedia

    en.wikipedia.org/wiki/TDC_Games

    For example, "Portable Puzzles" include a puzzle roll-up in each box. "Puzzles for Dummies" have numbered pieces and a grid to help put it all together, while "Visible Puzzles" have big pieces and a magnifying glass for the vision impaired. TDC also added a line of mini jigsaw puzzles w/timy pieces and tweezers to help assemble.

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

    www.aol.com/off-grid-sally-breaks-down-060027064...

    Go is a board game that originated in China more than 2,500 years ago. The black and white game pieces are called stones, and players attempt to capture each other's stones.

  9. Inshi no heya - Wikipedia

    en.wikipedia.org/wiki/Inshi_no_heya

    The puzzle starts with all the cells empty. The goal is to fill all the cells with nonzero single-digit numbers (1 through n, where n is the length of the grid's edge) such that: Solved Inshi No Heya grid The numbers in each room, when multiplied together, equal the small number in the upper left corner of the room

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