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Sat, 28 May 2022
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Spider sudoku, also known is ensaimada, is a sudoku variant puzzle.

In this puzzle, the regular square shaped grid is replaced instead with a circular grid, often in the shape of a spidersweb, hence it is called spider sudoku.

The difference between this and the regular sudoku is that one of the contraints is dropped; that is each cell belongs to two regions rather than three.

Spider sudoku is also usually effectively an 8 x 8 puzzle rather than 9 x 9 like standard sudoku; however different sizes are available.

A variant of spider sudoku adds an extra restraint, that no adjacent cells can contain consecutive digits.

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