Big Sudoku

Sudoku that actually lasts. Samurai Sudoku and 16×16 "Super" Sudoku for when you want a puzzle that takes more than a few minutes — and classic 9×9 Sudoku for when you just want a quick one. These are proper puzzles. The Samurai and Super Sudokus come in four levels of difficulty and none of them are trivial. If you complete one, you will have genuinely solved it. There are no cheats and no hints to carry you past a square you're stuck on. The 9×9 Sudokus come in the same four levels, from a gentle warm-up to genuinely fiendish. THREE WAYS TO PLAY • 9×9 — the classic, quick and satisfying • Samurai — five overlapping 9×9 grids for a much longer solve • 16×16 "Super" — a giant grid using numbers and letters (0–F) HELP WITH THE LEGWORK, NOT THE THINKING The app takes care of the bookkeeping so you can concentrate on the puzzle: • Auto pencil marks that fill in and update every possible…