Sum Sudoku medium to hard: 168 puzzlles

168 Sum-Sudoku Puzzles Medium to hard difficulty level Also called killer Sudoku or sumdoku, or addoku, or sumoku Puzzle grids of 4×4, 6×6, 8×8, 9×9 Two puzzles per page Puzzles with regular sub-grids/sub-domains (square or rectangle) Several puzzles with irregular sub-domains (like in jigsaw Sudoku) Most puzzles have as initial clues only the corresponding sums of killer Sudoku. Few puzzles have additional initial clues consisting of digits (like in partially filled puzzles). The last 10 puzzles are variations with additional constraints like in diagonal Sudoku, Windoku, anti-king and anti-knight Sudoku, anti-diagonal Sudoku number puzzles sudoku variation puzzles math puzzles