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Classic Sudoku 1

Sudoku (also known as «Number Place») is a placement puzzle. The puzzle is most frequently a 9 x 9 grid made up of 3 x 3 subgrids (called «regions»). Some cells already contain numbers, known as «givens». The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 9 exactly once. Each number in the solution therefore occurs only once in each of three «directions», hence the «single numbers» implied by the puzzle’s name.

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Classic Sudoku 5 5

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Classic Sudoku 9 7 8

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Classic Sudoku 13 8 3 6 7

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Classic Sudoku 17

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Sudoku X In some sudokus main diagonals also contain the digits 1 through 9. This variant is called «Sudoku X» or «Diagonal Sudoku». Use the check box Diagonals for such sudokus.

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Argyle Sudoku

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«Argyle Sudoku» contains additional diagonals; every marked diagonal line contains each digit not more than once. The argyle pattern is derived from the tartan of Clan Campbell, in eastern Scotland.

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Jigsaw Sudoku Also the puzzle may contain the regions of random (irregular) shape; this variant is called «Jigsaw», «Geometry Sudoku» («Geometry Number Place»), «Irregular Sudoku» or «Kikagaku Nanpure».

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Jigsaw Sudoku X 29 3

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Windoku Sudoku may contain additional four regions 3 x 3. This format was first introduced in the Dutch newspaper «NRC Handelsblad» by Peter Ritmeester. It is called «Windoku» («Four-Box Sudoku», «Hyper Sudoku»).

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Consecutive Sudoku In «Consecutive Sudoku» (or «1-away Disallowed Number Place»), all the places where orthogonally adjacent cells are consecutive numbers have been specially marked.

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Even-Odd Sudoku ÂŤEven-Odd SudokuÂť: fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. White cells must contain odd digits, gray cells must contain even digits.

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Sohei Sudoku X Named for the warrior monks of medieval Japan, ÂŤSohei SudokuÂť has four merged grids. Each grid has two overlapping areas.

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Jigsaw Samurai Sudoku «Samurai Sudoku» («Gattai-5») is one of the sudoku variation with overlapping sudoku grids. The puzzle consists of five grids, one in the center and the other 4 overlapping each corner grid of the central one. This means that the numbers must be placed correctly for all the five puzzle squares.

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ButterFly Sudoku

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Flower Sudoku X «Flower Sudoku» has five sudoku puzzles in layout, similar to Samurai Sudoku. However, these puzzles overlap each other much more than in Samurai. The center grid is fully covered by the remaining four sub-puzzles.

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«Butterfly Sudoku» is the variation of the original sudoku. The puzzle consists of four grids 9 x 9. The numbers must be placed correctly for all the four puzzle squares.

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Killer Sudoku 12

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In «Killer Sudoku», sub-regions have specified sums, and no number can be repeated within a region. This variant also called «Sums Sudoku», «Sums Number Place», «Samunamupure», «Kikagaku Nampure».

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Twin Sudoku 53

ÂŤTwin SudokuÂť consists of a pair of standard sudoku puzzles each with some starting digits. To get a complete solution for the twin puzzles, it is necessary to solve each twin puzzle, but the complete solution of the twin puzzles will be obtained by substituting the corresponding values of the digits from one twin sudoku into the other.

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Windmill Sudoku X «Windmill Sudoku» («Kazaguruma») consists of five grids, one in the center and the other 4 overlapping the central one. This means that the numbers must be placed correctly for all the five puzzle squares.

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