Science quiz
Click only the triangular numbers
The numbers 1 to 100 are on the board. Click all 13 triangular numbers in any order. Click anything else and the game is over.
- Format
- Click the grid
- Items
- 13 to click
- Limit
- 1:00
- Level
- Medium
- Checked
- 2026.10.03
- To find
- 13
- Time limit
- 1:00
- 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 all the triangular numbers, and nothing else. The grid appears when you start.
About this quiz
The triangular numbers are the running totals of 1 + 2 + 3 + 4 and so on: 1, 3, 6, 10, 15. The gaps between them grow by one each time.
- There are 13 triangular numbers from 1 to 100.
- The last one on the board is 91, the sum of 1 to 13.
- 1 and 36 are both triangular and square.
More quizzes like this
| No. | Quiz | Section | Format | Items | Added |
|---|---|---|---|---|---|
| 01 | Click only the Fibonacci numbers Click every one of the Fibonacci numbers from 1 to 100, and nothing else. There are 10 in the grid, and one wrong click ends the game. Science / Click the grid / 10 to click | Science | Click the grid | 10 | 2026.10.03 |
| 02 | Click the sums that make 12 Thirty short sums, and 12 of them come to exactly 12. Click every one that does. A sum that comes to anything else ends the game. Science / Click the grid / 12 to click | Science | Click the grid | 12 | 2026.10.03 |
| 03 | Click only the square numbers Click every one of the square numbers from 1 to 100, and nothing else. There are 10 in the grid, and one wrong click ends the game. Science / Click the grid / 10 to click | Science | Click the grid | 10 | 2026.10.03 |