Jigsaw Sudoku: 400 Medium to Hard Jigsaw Sudoku Puzzles(Irregularly Shaped Sudoku)

Series: 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").