Book Description: Everyone knows sudoku is enjoyableÂ—but these addictive puzzles come in endless variations too! They range from simple to very difficult, and can take almost no time to finishÂ…or require many hours. This entertaining collection showcases a wide range of possibilities, offering solvers who have become accustomed to the standard rules and grids an exciting new challenge. Select from Mega Sudokus that provide a real workout; Diagonals or Odd and Even versions with extra constraints; Sum Sudokus that merge with kakuro; and Multisudoku with overlapping puzzles. Thereâ€™s something for every levelÂ—12 x 12 puzzles, ones with irregularly shaped areas, even Mini SudokuÂ—and lots of fun for everyone.