DIVIDE FAST · 20 TRIALS
Decide whether each number is exactly divisible by 3 before time runs out.
Answer exactly 20 balanced questions. Mistakes and timeouts count, then play continues.
READY?
Press Y for YES or N for NO. On touchscreens, use the large buttons.
Keyboard: Y for YES · N for NO. Touch or mouse: choose a labeled button.
HOW TO PLAY
Start the game and read the integer shown in the center.
Choose YES if it divides evenly by 3. Otherwise choose NO.
Finish 20 standard trials, or maintain a perfect endless streak as the deadline shrinks.
THE RULE
A whole number is a multiple of 3 when dividing it by 3 leaves no remainder. You can also add its digits: if that sum is divisible by 3, the original number is too.
For example, 42 is a multiple because 4 + 2 = 6. The number 43 is not because 4 + 3 = 7.
READ YOUR RESULT
Standard mode always contains 10 multiples and 10 non-multiples. Wrong answers and timeouts lower accuracy but do not stop the game.
Average and best reaction times use correct answers only. Endless mode ends on the first mistake or timeout.
QUESTIONS
Yes, but this game uses only integers from 1 to 99, so zero will not appear.
The timeout is recorded as an incorrect response, and the next question appears. Standard mode always runs for exactly 20 trials.
The first question allows 2,000 milliseconds. Each correct answer shortens the next deadline until it reaches 400 milliseconds.
Yes. Use the two large touch buttons on mobile, or press Y and N on a physical keyboard.