Fancy yourself as a Sudoku boffin? Then Sudoku Xtreme is the ultimate challenge. After some difficult 9x9 Sudoku X+x puzzles, the solver begins the final ascent to the Sudoku Himalayas, with SuperSudoku X puzzles on 12x12 grids and UltraSudoku X puzzles on 16x16 grids, with not two but THREE overlapping grids: 8x2, 4x4 and 2x8. There are 100 puzzles in this book. The hardest of them will take an expert solver not less than six hours to complete. Hours of entertainment means value for money. Each puzzle is solvable by logical reasoning alone, without guesswork. The unique, cell-by-cell 'Stepping Stones' hints will help solvers to overcome sticking-points on the route to the solution. And each solution grid will be accompanied by a cell-by-cell explanation of the author's route to the solution. No other Sudoku book offers not only such a wide variety of different puzzle formats but also so many unique features helpful to the solver.