An attempt qualifies only if it follows these rules. Read them before continuing.
The software draws a three-digit number between 101 and 999 each round. Recall its square from memory and type the answer.
The timer starts when the first number is drawn and runs continuously for 30 seconds.
A correct answer counts only if submitted before 30 seconds expire. An answer submitted at zero or later does not count. One wrong answer ends the attempt.
No calculator, squares table, help from another person or other aids. The continuous screen recording must show the numbers, answers and timer.
The tool score is not a verified record. Submit the screen recording to Herzl, an AI judge, through the attempt form. Herzl reaches a reasoned verdict; unclear cases go to a human.
Memory challenge · 101-999
Squares in 30 seconds
Time30
Correct0
The software draws a number. Recall its square from memory and type only the answer. Submit before the timer reaches zero. One wrong answer ends the attempt.
?
Before starting, record your screen continuously so the drawn numbers, typed answers and timer are visible. No calculator, squares table or other aids. The tool score is not a verified record: submit the video through the attempt form for Herzl to review.
Time limit
30 continuous seconds
Location
Anywhere with a screen recording
Measurement
Correct answers before 30 seconds expire or before the first mistake
Record minimum
No artificial threshold; the first valid documented attempt sets the record after review
Verification method
Continuous screen recording showing the numbers, typed answers and timer
