Sudoku took the puzzle world by storm, but some fans have grown a bit bored with the constant repetition of 1 through 9 and 3×3 boxes. With variations such as overlapping and oversize grids, diagonals, shaded squares, and more, these puzzles bend the rules and bring something new to the game. Each gem is like a crazy cousin of standard sudoku—and solvers will be overjoyed to join the family reunion.