Speed quiz
Odd or even? Sorting blitz
One number at a time, anywhere from 1 to 999. Press Odd or Even. A round is thirty numbers on a thirty second clock.
- Format
- Sort into groups
- Items
- 30 to sort
- Limit
- 0:30
- Level
- Easy
- Checked
- 2026.10.03
A fresh 30 of the 60 each time. Today's first round is the same for everyone.
- Items
- 30
- Groups
- 2
- Time limit
- 0:30
- A miss
- Shows the answer, then moves on
- Each number appears in turn. Click its kind, or press its number.
- The groups never move, so the number keys are quick.
- Skip (0) sends a prompt to the back of the queue.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Press Odd or Even for each number. The groups appear when you start.
About this quiz
A reaction test dressed as arithmetic. A whole number is even when its last digit is 0, 2, 4, 6 or 8; the digits in front are only there to distract.
- The pool is sixty numbers, thirty odd and thirty even.
- A wrong press shows the right answer and the round moves on.
- The full run plays all sixty numbers with its own best score.
More quizzes like this
| No. | Quiz | Section | Format | Items | Added |
|---|---|---|---|---|---|
| 01 | Digits of pi Type the digits of pi after 3, one at a time, up to 150 places. One wrong digit ends the run, so go as far as you can. Speed / Type them all / 150 answers | Speed | Type them all | 150 | 2026.10.02 |
| 02 | Click only the primes Click every prime number from 1 to 100, and nothing else. There are 25 primes in the grid, and one wrong click ends the game. Speed / Click the grid / 25 to click | Speed | Click the grid | 25 | 2026.10.02 |
| 03 | Type 1 to 60 in 30 seconds Type every number from 1 to 60 in 30 seconds. Each number is taken the instant you finish it, so it is two keystrokes a tick or nothing. Speed / Type them all / 60 answers | Speed | Type them all | 60 | 2026.10.03 |