iPhone
About this app
Every number counts the neighbours unlike it. That is the entire rule. Each square is either solid or outlined, and a numbered square tells you how many of the four squares touching it — above, below, left and right — are the opposite of itself. Everything else follows from reasoning. NEVER A GUESS Every board is generated and then checked before you ever see it: exactly one solution, and that solution reachable by deduction alone. Beginner, Intermediate and Hard boards need nothing but direct logic — never "suppose this square is solid and see what breaks". Expert and Impossible boards permit that step at most once. Anything harder is thrown away and regenerated. If you are stuck, there is a move to find. THE SAME BOARD FOR EVERYONE Level 17 is the same grid on every device, and the same again after a reinstall. Compare times with a friend and you know you solved an identical puzzle. HINTS THAT EXPLAIN RATHER THAN SPOIL The first hint points at the clue that is ready to be used. The second spells out the deduction behind it. Only the third fills the square in for you. Stop at whichever tier you like. Three hints a board, so spending one is a decision — and your stars remember how much help you took. WHAT YOU GET • A 200-level ladder that climbs from 4×4 warm-ups to 9×9 grids with two clues in three stripped away • A seven-step tutorial that has you solving unaided before it ends • Free play at five difficulties, and a daily board seeded from today's date • Undo, redo, check your work, or clear the grid and keep the clock running • Three stars for an unaided solve, two if you read a hint or two, one if you had a square filled in • Nine themes — three earned by playing, six in the theme store NINE WAYS TO LOOK AT IT Parchment's warm paper and ink. Midnight's quiet glow at 1am. Citrus, Deep Forest, Bubblegum, Neon Arcade, Blueprint, Ember and Chalkboard. Each changes the palette, the shape of the squares and the mark inside a filled one — and the board on the home screen wears whichever one you have on. BUILT TO BE PLAYED BY ANYONE VoiceOver labels on every square and every control. Dynamic Type throughout. High-contrast and reduce-motion modes. Haptics and sound you can switch off. Nothing on the board is graded unless you ask for it — and auto-check is one tap away, beside Check, on the days you want it. QUIET BY DESIGN No account. No sign-in. No idea who you are. Unlike works entirely offline, and your progress is written to your device and nowhere else. The free game shows an ad after some levels from level four onward. One payment removes them for good.
