Speed quiz
Click the leap years
Every year on the board is even, so none is easy to rule out. Click the 18 leap years of the Gregorian calendar and leave the rest.
- Format
- Click the grid
- Items
- 18 to click
- Limit
- 1:15
- Level
- Medium
- Checked
- 2026.10.03
- To find
- 18
- Time limit
- 1:15
- Minefield
- One wrong click ends it
- Click every valid item, in any order.
- Decoys look plausible. Read carefully.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Click every leap year, and nothing else. The grid appears when you start.
About this quiz
A year is a leap year when 4 divides it, unless 100 divides it too, in which case 400 must as well. So 1900 was not a leap year, 2000 was, and 2100 will not be.
- Of the nine century years on the board, only 1600, 2000 and 2400 are leap years.
- The rule keeps the calendar year within about 26 seconds of the solar year.
- The grid is in date order.
More quizzes like this
| No. | Quiz | Section | Format | Items | Added |
|---|---|---|---|---|---|
| 01 | Click the months in order Click the 12 months of the year in calendar order, January to December, three times over. The grid reshuffles after every click. Speed / Click the grid / 36 to click | Speed | Click the grid | 36 | 2026.10.03 |
| 02 | Click 1 to 100 Click the numbers from 1 to 100 in order. The grid reshuffles after every correct click, and one wrong click ends the game. Speed / Click the grid / 100 to click | Speed | Click the grid | 100 | 2026.10.02 |
| 03 | Anything but 7 Click every number from 1 to 70 that has nothing to do with 7: not a multiple of 7 and no 7 among its digits. 54 are safe. Speed / Click the grid / 54 to click | Speed | Click the grid | 54 | 2026.10.03 |