Arithmos: Math for nerds

Arithmos turns mental math into a game. Race the clock in fast arithmetic drills, climb an ELO leaderboard, challenge friends live, and unlock puzzles that train speed, focus, and number sense — all in a clean, distraction-free design. Whether you're prepping for exams, building calculator-free confidence, or just want a sharper brain, Arithmos gives you a new way to practice every day. ★ TIMED ARITHMETIC DRILLS Solve addition, subtraction, multiplication, and division problems against the clock. Fully customizable — pick your operations, number ranges, and round length. Classic zetamac-style speed training, your way. ★ 32 PROGRESSIVE LEVELS Work through a structured level path that ramps difficulty step by step, with your completion percentage tracked right on the home screen. ★ QUESTS — BUILD YOUR OWN DRILL Design a custom quest with the exact operations, ranges, and timer you want, save it, and replay it whenever you like. ★ FOUR BRAIN PUZZLES • Largest Number — build the biggest number you can • Prime Hunt — spot primes under pressure • Sliding Puzzle — classic number-sliding logic • Shape Arithmetic — decode shape equations before time runs out ★ ELO RATING & TIERS Every result changes your rating. Climb through five tiers — Scholar, Mathematician, Professor, Genius, and Legend — by beating higher-rated players, and track your progress on the ELO Standings board. ★ GLOBAL LEADERBOARDS Compare your best scores and speed against players worldwide, with country flags on every leaderboard entry. ★ PLAY WITH FRIENDS Create a private room, share a code, and race friends live — same questions, same clock, real-time results, and instant rematch. ★ YOUR PROFILE, YOUR WAY Sign in with Google, pick a gamer ID and country, choose whether your name shows on leaderboards, and switch between light and dark themes. WHO IT'S FOR Students sharpening exam speed, competitive test-takers who need fast mental math, teachers and tutors looking for warm-up drills, and anyone who wants a quick, satisfying brain workout between tasks. Arithmos is minimal by design — no clutter, no distractions, just numbers, a timer, and your progress. A few minutes a day is enough to feel the difference. Download Arithmos and start your first drill in seconds.