Outside Sudoku medium to hard

100 Outside Sudoku Puzzles: 90 classical outside Sudoku puzzles and 10 variations of Outside Sudoku Puzzles with additional constraintsNew variations from classical Sudoku puzzles with the clues places outside the puzzle's grid.Puzzle grids of 9x9 with square 3x3 sub-domains, like in classical SudokuFor more variety, the last 10 puzzles have additional constraints like in diagonal Sudoku, hyper-Sudoku, anti-knight Sudoku, anti-diagonal Sudoku, anti-King Sudoku, etc.Puzzles with non-symmetric and several with symmetric placement of the clues.One puzzle per pagemath puzzle booknumber puzzles