250 excellent puzzle 9x9 at the level of hard. All riddles have only 1 solution. 2 puzzles per page.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.
