How fast is your head?
Pick a topic and a level, then race the clock. Every answer is marked the instant you press Enter. Streaks multiply your points; your bests are kept per topic.
No account needed. Custom AI coaching is optional.
1 · Topic
2 · Level
3 · Clock
0-9 . - / type · Enter answer · 1-4 pick a choice · Tab skip · Esc stop
No round to hand? or — their coach replies replay free.
Fresh items from the coach
For a topic the bank does not cover, or levels 4 and 5. Every item comes with a check expression; your browser re-computes it and rejects any item that does not add up before you ever see it.
Your decks
Personal bests
| Topic | Lvl | Clock | Score | Accuracy | Streak | Median | Rounds |
|---|
Past rounds
How the scoring works
- A right answer earns 100 points plus a speed bonus of up to 50, shrinking as the item's clock runs down.
- Five right in a row multiplies by 1.5; ten in a row by 2. A wrong answer, a skip or a time-out resets the streak.
- Ten-item rounds give each item its own clock: 8 s at level 1, 10 s at level 2, 14 s at level 3, more for long word items.
- Sprints run one 60-second clock; the item on screen when it ends is not counted.
- Fractions can be typed as 3/4 or 0.75; negative answers with a leading minus.