SUSTAINED RULE · 45 STIMULI
Respond to every number except 3. When 3 appears, hold your response.
Complete 45 rapid stimuli. Wrong presses and missed responses count, then play continues.
READY?
Keep the rule active as the digits change quickly.
Keyboard: Space · Mouse or touch: use the large response area · Do nothing when the digit is 3.
HOW TO PLAY
Watch the center as one digit at a time appears.
Press Space or tap quickly for 1, 2, and every digit from 4 through 9.
When the digit is 3, do not press. Let the timing bar finish on its own.
GO / NO-GO STREAM
Most digits require the same response, which builds a fast rhythm. The rare 3 asks you to interrupt that rhythm.
Standard mode mixes five no-go targets among forty go digits in a shuffled 45-stimulus set.
READ YOUR RESULT
Correct holds and correct presses both improve accuracy. Average reaction time uses correct go responses only.
This browser game is for entertainment and personal practice, not diagnosis or clinical assessment.
QUESTIONS
No. Hold your response and wait for the next digit.
It means the stimulus window ended on a digit other than 3 before you pressed.
The uncommon no-go target makes maintaining the exception rule more challenging during repeated go responses.
Pressing on 3 or missing any go digit ends the run immediately.