Sudoku Extended

Sudokus are everywhere, so a new book has to offer something different. If you love them, the answer is to extend the sudoku concept itself. Sudoku Extended is a sudoku puzzle book that raises the difficulty format by format, for readers who find a standard hard sudoku too quick.

How the advanced sudoku formats build up

• After a range of warm-up puzzles, additional formats are added: you settle in before the grids change shape.
• Try the combination Sudokus: overlapping grids make each placement more challenging, because one digit affects two puzzles.
• Challenge yourself with 1–16 Sudokus: sixteen symbols per row stretch your logic far beyond the usual nine.
• And get really stretched with the Ultimate format: 1–36 Sudokus.

Advanced sudoku strategies for hard puzzles

In practice, larger grids reward the advanced sudoku strategies you already use. Elimination across thirty-six candidates takes patience, and an X-wing or swordfish pattern can open up a stuck region when simple scanning finds no solutions. These are hard puzzles, best suited to experienced solvers rather than beginners.

Free puzzles for sudoku fans who want more

Better still, buying the book means you can opt to get 3 months' free puzzles sent to your email as large-format downloads. The large format is useful for printing: there is room to pencil in candidates on the bigger grids. Picture spotting your first X-wing on a 1–36 grid, then opening next month's expert puzzles in your inbox.