Tessera: Sudoku & Nonogram

Three classic logic puzzles in one app: Sudoku, Killer Sudoku and Nonogram. Tessera is built around one idea — the difficulty label should be honest. Every puzzle has exactly one solution, and that is proved rather than assumed. A tier is named after the hardest technique a puzzle actually needs, not by how long a solver took to give up. If a board is labelled Expert, it is because it genuinely requires swordfish or quads; if it is Easy, singles will finish it. The app knows twenty-two techniques by name and will tell you which one a hint just used. PUZZLES • Sudoku 9×9 — five tiers, from singles to chains • Killer Sudoku 9×9 — cages and sums, no given digits, as the genre intends • Nonogram — 5×5 to 20×20 picture logic, no guessing ever required WHILE YOU PLAY • Pencil marks, unlimited undo, and an erase that only clears what you put there • Three levels of hint: where to look, which technique applies, and only then the answer • Optional mistake limit, with a second chance if you want one • Drag to paint whole runs on a nonogram, with completed lines crossed off for you EVERY DAY • A Daily Challenge of three puzzles, one of each type • A calendar you can play back through, and one trophy per perfect month LEARNING • Three tutorials that are real boards with the keypad live — nothing is a video, you play every step OFFLINE, AND MEANT IT Puzzles are generated on your phone. Times, streaks and awards are stored on your phone. There is no account, no sign-in, no sync and no analytics. Tessera makes no network request of its own; the only traffic is the ad SDK, and removing ads removes that too. Ads appear on the menu, on the reading screens, beside a board while you play, when a puzzle ends and when the app opens. Nothing ever takes over the screen mid-puzzle.