Sudoku Offline Puzzle Game

There is only ever one right answer, and that is not a detail. It means every square can be reasoned to, and that nothing in this app ever needs a guess. If you are stuck, you are missing a step - not luck. TWO SIZES, INFINITE WAYS TO PLAY The classic 9x9 for traditional purity, and the massive 16x16 for when nine symbols stop being enough. The bigger grid is simply the same pure logic puzzle with more bookkeeping: the techniques do not change, only the amount of data you have to hold in your head at once. FIVE LEVELS, GRADED BY WHAT THEY ACTUALLY ASK OF YOU Levels are never measured by how many random squares we took away. They are strictly graded by the hardest logical technique the puzzle actually demands to be solved: - Easy: Naked and hidden singles are enough to clear the board. - Medium: You will need to spot and master pairs. - Hard: Pointing pairs, box-line reduction, and triples come into play. - Expert: Reserved for masters of X-Wing, Swordfish, and XY-Wing. - Diabolical: Pushing beyond all standard boundaries for absolute mastery. Every single puzzle is algorithmically generated with a single solution and thoroughly checked before it ever reaches your device. A HINT THAT TEACHES INSTEAD OF SKIPPING The hint button fills in a square you could have worked out yourself - never one you could not. Asking for help shows you the exact logical step rather than taking the puzzle away from you. You stay in control of your victory. PENCIL MARKS Where a hard grid actually gets solved. Pencil mode is a tool, not a crutch: the true difficulty is always in choosing which square to attack next, never in remembering what you decided about its candidates. THE DAILY CHALLENGE One puzzle a day, precisely the same one for everybody around the world, with a live clock running. Sign in only if you want your time on the leaderboard - that is the absolute only thing an account is for, and every other feature works seamlessly without one. YOUR NUMBERS, KEPT FOREVER Games finished, best times, and ongoing streaks, tracked independently for every single size and every level separately. Ten 9x9 Medium wins will never touch your 16x16 statistics. IT OPENS BY PLAYING, NOT BY PAYING Each level after the first asks for ten finished games on the level just below it, at the exact same size. There is no way to buy past it, because there is literally nothing to buy in this app at all. Progress is earned through skill alone. FREE, WITH ADVERTS, AND THAT IS THE WHOLE DEAL No hidden purchases. No recurring subscription fees. No locked puzzles waiting for a credit card number. The lightweight adverts pay to keep the lights on, and the game stays entirely free - all of it, forever. WORKS COMPLETELY OFFLINE Puzzles are built right on your phone, not streamed from a remote server. On a plane, deep in a subway tunnel, or anywhere the signal is completely gone: it plays exactly the same. ALSO WORTH KNOWING It was originally printed in America as Number Place before Japan gave it the famous name everybody uses today, and it finally reached the rest of the world through a newspaper column back in 2004. The crucial point nobody makes often enough: there is no arithmetic in it at all. The nine symbols could just as well be nine distinct colours. FROM BRAIN GAMES One of a family of handcrafted games made by the same people, built on the exact same honest promise: you can always play, and you will never be asked to pay for the game. Discover the rest of them at brain-games.app, where they also run straight in your web browser.