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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent paradox is explained by the fact that the side of the new large square is a little smaller than the original one. If θ is the angle between two opposing sides in each quadrilateral, then the ratio of the two areas is given by sec 2 θ. For θ = 5°, this is approximately 1.00765, which corresponds to a difference of about 0.8%.

  3. Room number - Wikipedia

    en.wikipedia.org/wiki/Room_number

    A room number is a number assigned to a room within a building. Its purpose is to identify a particular room, and help building inhabitants locate that room. [1] Room numbers may consist of three digits, but can be any number of digits. The room number is generally assigned with the first digit indicating the floor on which the room is located ...

  4. Kakuro - Wikipedia

    en.wikipedia.org/wiki/Kakuro

    The popularity of Kakuro in Japan is immense, second only to Sudoku among Nikoli's famed logic-puzzle offerings. [2] The canonical Kakuro puzzle is played in a grid of filled and barred cells, "black" and "white" respectively. Puzzles are usually 16×16 in size, although these dimensions can vary widely.

  5. Takuzu - Wikipedia

    en.wikipedia.org/wiki/Takuzu

    Likewise, if two cells contain the same digit with one empty cell in between, this empty cell must contain the other digit, because otherwise three same digit appears (x1x1xx → x101xx). Eliminate the impossible. For example, if the sixth cell in 110xxx is made a 1, balancing the number of 0s and 1s forces a trio to appear (110xxx → 110xx1 ...

  6. Eight queens puzzle - Wikipedia

    en.wikipedia.org/wiki/Eight_queens_puzzle

    In the game The 7th Guest, the 8th Puzzle: "The Queen's Dilemma" in the game room of the Stauf mansion is the de facto eight queens puzzle. [ 29 ] : 48–49, 289–290 In the game Professor Layton and the Curious Village , the 130th puzzle: "Too Many Queens 5" ( クイーンの問題5 ) is an eight queens puzzle.

  7. Tower of Hanoi - Wikipedia

    en.wikipedia.org/wiki/Tower_of_Hanoi

    The Tower of Hanoi (also called The problem of Benares Temple [1], Tower of Brahma or Lucas' Tower [2], and sometimes pluralized as Towers, or simply pyramid puzzle [3]) is a mathematical game or puzzle consisting of three rods and a number of disks of various diameters, which can slide onto any rod.

  8. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    This sum can also be found in the four outer numbers clockwise from the corners (3+8+14+9) and likewise the four counter-clockwise (the locations of four queens in the two solutions of the 4 queens puzzle [50]), the two sets of four symmetrical numbers (2+8+9+15 and 3+5+12+14), the sum of the middle two entries of the two outer columns and rows ...

  9. 15 puzzle - Wikipedia

    en.wikipedia.org/wiki/15_puzzle

    Named after the number of tiles in the frame, the 15 puzzle may also be called a "16 puzzle", alluding to its total tile capacity. Similar names are used for different sized variants of the 15 puzzle, such as the 8 puzzle, which has 8 tiles in a 3×3 frame. The n puzzle is a classical problem for modeling algorithms involving heuristics.