Rapid random switching of +, −, × and ÷ for peak mental flexibility.

Train mental processing speed under the pressure of the clock.

Granular accuracy breakdown, personal bests, and long-term progress.

Completely free, uninterrupted focus. No credit card required.

Solve the problem in your head. Tap the card to reveal the answer, and tap again to draw the next problem.

Enter answers using the ergonomic numeric keypad to drill instant reflexes and absolute accuracy.

Tap the target icon in the header or the bottom badges to easily switch operations (+, −, ×, ÷, 🎲) and number ranges.

The ultimate challenge with randomized operations for maximum mental adaptability.

60-second time trial under the ticking clock to push your cognitive speed limits.

In-depth breakdown of your accuracy, streaks, and personal records across all disciplines.