500 Sudoku Jigsaw Killer Puzzles Hard

The books contains 500 Jigsaw Killer Sudoku puzzles 9x9 at the level of Hard. 6 puzzles per page. All riddles have only 1 solution. Perfect for Advanced players.The font size is correct, you will not have to strain your eyes when solving puzzles.High quality paper and print (all puzzles read well, easy to write with pen and pencil without worry of bleed-through). Jigsaw Killer Sudoku combines Jigsaw and Killer Sudoku, replacing the 3x3 regions of regular Sudoku with irregular jigsaw shapes, and adding in the numerical cage constraints of Killer Sudoku. In killer sudoku: additional numbers are given - the sums of values in groups of cells.