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This Stock Puzzle consists of a 4×5 board with sliding blocks. One block is 2×2; the other blocks are 2×1, 1×2 and 1×1. The goal of the puzzle is to get the 2×2 block into the bottom position.

There are variations of this puzzle based on differences in the initial position, or in the number of blocks of various sizes. It is sometimes known as the Dad's Puzzle, where the theme is a father trying to move around pieces of furniture, or the Pennant Puzzle.

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Examples:

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    Anime and Manga 
  • The video for the MegaMan NT Warrior ending theme, Hikari Todoku Basho, has a short animation of the puzzle being solved in the background near the start of the video.

    Television 
  • A regularly used challenge component throughout the history of Survivor but known by the more generic term 'slide puzzle'. Typically an ax or other blade is embedded in the 2x2 piece; after freeing the piece, the blade is used to cut a rope, which often unfurls a victory banner. In more recent years, an eight piece/4x4 variant is more often used, occasionally with crate-size pieces so large that they require several people to move.

    Video Games 
  • The "World's Most Difficult Trick" in Lufia II: Rise of the Sinistrals.
  • The furniture puzzle in The 11th Hour.
  • The "Last Pedestal of Buddha" in Quest For Karma.
  • The Archie Comics Web site has a Java puzzle called "Traffic Jam", in which the player must move Archie's red car to the exit by rearranging other vehicles in the parking lot.
    • A physical version of this has been sold under the name "Rush Hour".
  • One of the games included with Microsoft Entertainment Pack 3 is Klotski: three levels of eight puzzles each, starting with several variants of the puzzle described above, then moving through more complex puzzles and culminating in a 27×27-square puzzle titled Sunshine. This final puzzle, requiring some 2,000-plus moves to get the 5×5 block to its home, takes not so much ingenuity as patience: With only five squares' leeway, each square required for a single move of the red piece, work the red piece down to the door, then tediously work it around the edge of the puzzle and back up to the top.
  • One of the late-game safes in Safe Cracker: The Ultimate Puzzle Adventure.
  • The GNOME desktop environment includes a straightforward Klotski game in the GNOME Games package.
  • And if you thought this kind of puzzle was hard enough, don't even look at Bricks, a Windows/DOS Klotski clone that includes, among other things, magnetic pieces, walls that pop up if you slide something over them, pieces that can't move until a certain "key" piece is brought to a certain position, and unconnected groups of pieces that move as one unit. And that's just in the first installment.
  • This type of puzzle appears in the Professor Layton games, naturally. Obscenely difficult versions are also the final puzzles in each game.
  • The Adventure Game Companions of Xanth includes an optional Klotski puzzle.
  • A few puzzles in the PC version of Spongebob Squarepants Battle For Bikini Bottom.
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    Real Life 
  • The International Obfuscated C Code Contest had a winning entry one year that solved this puzzle. Here's the catch: When presenting its moves and the current state of the board, it would print out valid C code (obfuscated to look like the blocks)... which actually compiled into a program that did the same thing but faster.

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