Jigsaw Sudoku: 400 Medium Jigsaw Sudoku Puzzles (Irregularly Shaped Sudoku)
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Jigsaw Sudoku: 400 Medium Jigsaw Sudoku Puzzles (Irregularly Shaped Sudoku)
Also the puzzle may contain the regions of random (irregular) shape; this variant is called Jigsaw Sudoku ("Geometry Sudoku," "Geometry Number Place," "Irregular Sudoku," "Kikagaku Nanpure").