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  2. There is nothing to download, just start playing any of our free online puzzle games right now! Browse and play any of the 40+ online puzzle games for free against the AI or against your friends.

  3. 10 of the best free online puzzles to enjoy at home - AOL

    www.aol.com/news/10-best-free-online-puzzles...

    Who doesn’t love a game of Tetris? Enjoy the addictive shape-fitting puzzle for hours on end. PLAY HERE. 8. 10 x 10. Enjoy this modern twist on a classic, logical puzzle!

  4. Klotski - Wikipedia

    en.wikipedia.org/wiki/Klotski

    Klotski. In a Klotski puzzle, the largest block must be moved to the bottom middle location so that it can be slid over the border, without any of the other blocks being removed in this way. Klotski (from Polish: klocki, lit. 'wooden blocks') is a sliding block puzzle thought to have originated in the early 20th century.

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

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

    Simply Jigsaw. Piece together a new jigsaw puzzle every day, complete with themes that follow the seasons and a super useful edges-only tool. By Masque Publishing. Advertisement.

  6. 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 ...

  7. Mathematics of Sudoku - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_Sudoku

    Mathematical context. The general problem of solving Sudoku puzzles on n2 × n2 grids of n × n blocks is known to be NP-complete. [8] A puzzle can be expressed as a graph coloring problem. [9] The aim is to construct a 9-coloring of a particular graph, given a partial 9-coloring. The Sudoku graph has 81 vertices, one vertex for each cell.