Mini Games
Flash Mental Math
Numbers flash by one at a time — add them in your head and type the total. A brain-training anzan drill.
How to play
- Press Start — numbers flash on screen one after another.
- Add them all up in your head, then type the total and press ✓.
- Each cleared round gets faster and harder. One wrong answer ends the run — how far can you go?
My Best
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How many rounds can you clear?
Ranking
Rankings reset daily at 00:00 (UTC+0 base).
| RANK | Nickname | Score |
|---|---|---|
| RANK | Nickname | Score |
|---|---|---|
- |  YOU | - |
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Records are not shared across different browsers or devices.
Test your other brain stats
Flash Mental Math is a soroban-style anzan game: numbers blink on screen one at a time, then you type their total from memory. Each round you clear gets harder — more numbers, bigger digits, faster flashes — and one wrong sum ends the run.
This flash mental math drill trains working memory and lightning addition at once. See how many rounds you can survive, then keep going with the mental math sprint, number memory, and chimp test.