MathDoku — Number Puzzle

MathDoku turns a quiet ten minutes into the best brain workout in your day. Inside every grid is a small, elegant arithmetic puzzle (also known as Calcudoku): fill each row and column with the numbers 1 to N without repeats, while the cells inside each outlined "cage" combine — using add, subtract, multiply, or divide — to hit its target. No guesswork. Just clean, deductive reasoning. WHY YOU'LL LOVE MATHDOKU • 180 hand-curated, uniquely-solvable puzzles across 6 difficulty tiers — Easy 4×4 all the way up to Grandmaster 9×9. • A free Daily Challenge every calendar day — the same puzzle for everyone, with a streak that grows the longer you keep showing up. • Smart hints that point to the next deductive move when you're stuck, never the answer. • Stars, best times, and progress that unlock the next world as you sharpen up. • Five gorgeous themes — Parchment, Midnight, Meadow, Orchid, Sunset — pick the mood, then crush the grid. • Subtle sound and haptics that celebrate every correct placement. • Game Center leaderboards and achievements when you want to compete. • A shareable solve card so you can flex on the group chat. BUILT TO LAST • Fully offline. No accounts. No network. No ads. No interruptions. • Color-blind palette, VoiceOver labels, Dynamic Type — accessibility built in. • Right-to-left layout for Arabic; localized in 11 languages. • Onboarding teaches by doing — tap a real puzzle, no walls of text. MathDoku is the puzzle for people who love crosswords but want something more rigorous, for sudoku fans who want a sharper challenge, and for anyone who finds calm in the click of a number falling into the only place it can possibly go. Open the app. Solve one. See the streak begin.