FOLLOW THE RULE · 20 TRIALS
Compare the same two features—but obey the rule that changes above them.
Complete 20 balanced trials. Mistakes and timeouts count, then play continues.
READY?
Read MATCH COLOR or MATCH SHAPE first. Then press S / ← for SAME or D / → for DIFFERENT.
Keyboard: S / ← for SAME · D / → for DIFFERENT. Touch: tap a labeled button.
HOW TO PLAY
Start the game and read the bright rule banner: MATCH COLOR or MATCH SHAPE.
Compare only that feature. Ignore the other feature, which is designed to suggest the opposite answer.
Choose SAME or DIFFERENT before the timing bar empties. Standard lasts 20 trials; endless gives you one life.
COGNITIVE FLEXIBILITY
Each trial asks you to apply one of two rules to the same kind of visual display. The rule changes often, so a response that was useful a moment ago may no longer fit.
Color and shape always disagree as evidence. That conflict makes the rule banner essential instead of decorative.
READ YOUR RESULT
Standard mode balances all four targets: color-same, color-different, shape-same, and shape-different. Average and best reaction times use correct answers only.
This is a recreational browser game, not a clinical assessment. Device latency, input method, color perception, focus, and practice can affect results.
QUESTIONS
Read the rule above the cards. Choose SAME or DIFFERENT by comparing only the named feature: color or shape.
Press S or Left Arrow for SAME. Press D or Right Arrow for DIFFERENT. The two large buttons work on touch screens.
Endless mode starts with a 2.4 second limit. The limit shrinks toward 0.6 seconds, and one mistake or timeout ends the run.
No. The irrelevant feature always points toward the opposite answer, so you must follow the current rule.