A little mental maths
Find the missing answer.
17 + 21= ?
17 + 21 = 38.
CHALLENGE NO. 15 · CLOSEDPuzzles for
Puzzles for
18 September 2026.
The six questions everyone saw that day, with answers and explanations.
0players finished
Make it make sense
Unscramble the letters. Clue: a machine that produces power to make something move.
NEIGEN
ENGINE — a machine that produces power to make something move.
Find your rhythm
Which number comes next?
371115?
Add 4 each time. The next number is 19.
Keep the numbers moving
Find the missing number.
6 × ?= 42
6 × 7 = 42.
On the same wavelength
Choose the closest meaning.
VANISH
vanish means disappear.
One last connection
Follow the pattern. What comes next?
571014?
The gaps grow by one: +2, +3, +4, then +5. 14 + 5 = 19.
Correct answers rank first and elapsed time breaks ties, so a careful six beats a fast five. Read how the puzzles are made or report an unclear question with this date.