Sudoku Nine

Sudoku Nine is a clean, no-fuss version of the number puzzle that millions of people reach for every day. The rules are simple. You get a nine-by-nine grid, partly filled in. Your job is to complete it so that every row, every column, and every three-by-three box contains the digits one through nine, with no repeats anywhere. Some squares are given to you as clues; the rest are yours to work out through pure logic. Every puzzle is generated fresh and has exactly one solution, so you never have to guess — there's always a next move you can reason your way to. Choose from several difficulty levels, from a gentle warm-up to a real challenge that will have you scanning the whole board for the one square you can be sure about. Tap a square, pick a number, and it drops in. Not sure yet? Turn on notes and pencil in the small candidates for a square, just like you would on paper, then clear them once you've solved it. A gentle hint is there if you get truly stuck, and the game quietly flags when a number clashes with one you've already placed. A timer tracks each solve and your best time for every difficulty is saved, so there's always a record to chase. The whole thing runs offline, with no ads, no account, no sign-up, and no special permissions. Open it and start solving.