Zeta Two: Mental Math

Train your brain in 60 seconds a day. Zeta Two is a mental math trainer built for people who want to think faster — whether you're brushing up on times tables, prepping for a test, or just keeping your mind sharp on the subway. Four operations, four difficulties, two input modes, and a clean neubrutalist look that gets out of your way so you can focus on the numbers. HOW IT WORKS Pick a difficulty, pick a mode, and go. The clock starts, questions fly, and every correct answer stacks points. Miss too many in Standard mode and it's game over — go Free-flow if you'd rather just keep drilling. Your top 10 runs are saved locally, no account needed. FOUR OPERATIONS • Addition • Subtraction • Multiplication • Division Toggle any combination on or off. Train only what you need. FOUR DIFFICULTIES + CUSTOM • Easy — perfect for beginners and young learners • Medium — a balanced daily workout • Hard — test your real speed • Extreme — three-digit arithmetic for math masters • Custom — dial in exact number ranges per operation TWO INPUT MODES • Keyboard — type the answer with a big, tactile number pad • Cards — pick from multiple choices (2, 4, 6, or 8 options) TWO GAME MODES • Standard — 5 mistakes max, auto-submit on full answers. Focused and punishing. • Free-flow — unlimited attempts, drill as long as the timer runs CONFIGURABLE ROUND LENGTH 60, 120, or 180 seconds — whatever fits the gap in your day. DETAILED STATS AFTER EVERY GAME • Score and accuracy • Questions per minute • Average time per question • Per-operation breakdown so you can see which drills to prioritize next LOCAL HIGH SCORES Your top 10 runs are stored on-device with difficulty, accuracy, and date. No accounts. No cloud. No tracking leaderboards. WHO IT'S FOR • Students prepping for timed math tests • Parents helping kids build fluency with times tables • Professionals who live in spreadsheets and want to stay sharp • Anyone who likes the satisfaction of numbers clicking into place DESIGNED FOR FOCUS Bold colors, chunky buttons, zero clutter. The UI stays out of your head so the numbers can stay in it. Works great on iPhone in portrait — pull it out, play a round, put it away. OFFLINE-FIRST Zeta Two runs fully offline. No login. No data collection beyond what's needed to show ads. Download Zeta Two and see how many you can solve before the buzzer.