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A Sudoku whose regions are not (necessarily) square or rectangular is known as a Jigsaw Sudoku. In particular, an N×N square where N is prime can only be tiled with irregular N-ominoes. For small values of N the number of ways to tile the square (excluding symmetries) has been computed (sequence A172477 in the OEIS). [10]
Larger grids are also possible, or different irregular shapes (under various names such as Suguru, Tectonic, Jigsaw Sudoku etc.). The Times offers a 12×12-grid "Dodeka Sudoku" with 12 regions of 4×3 squares. Dell Magazines regularly publishes 16×16 "Number Place Challenger" puzzles (using the numbers 1–16 or the letters A-P).
Minimum Su Doku [4] – The class of puzzles which have the minimum number of clues needed to allow a complete and unique solution, i.e. minimal Sudokus. Jigsaw Sudoku – Regular 9×9 Sudoku that row and column rules apply, but instead of a 3×3 grid they are nine Jigsaw shapes.
It was released in Japan on June 2 as Sudoku to 3-Tsu no Puzzle: Nikoli no Puzzle Variety (数独と3つのパズル～ニコリのパズルバラエティ～, Sudoku and 3 Puzzles: Nikoli Puzzle Variety); [21] in Europe on June 9 as Sudoku – The Puzzle Game Collection; [22] and in America as Nikoli's Pencil Puzzle on October 25.
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The results revealed that 4 and 5 year olds were able to complete all three puzzles within the allotted time, meanwhile most 3-year-olds were able to complete the normal jigsaw puzzle and the puzzle of normal shaped pieces without an image on it but struggled more with the puzzle that had an image but all the pieces were shaped the same.
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