How do you discover the card sorting rule?

Compare the target card with all three category cards, choose a slot, and use correct or incorrect feedback to infer whether color, shape, or quantity currently matters.

When does the sorting rule change?

The rule changes without an announcement after a run of correct sorts. Endless mode changes it more frequently.

Which keyboard controls can I use?

Press 1, 2, or 3 to choose the corresponding category slot.

Is this a diagnostic card sorting test?

No. This is a recreational game and not a clinical cognitive assessment.

HIDDEN RULE · 30 CARDS

CARD SORTING RULE GAME

Use feedback to discover whether color, shape, or quantity decides the correct slot.

CARDS0 / 30

Sort 30 cards. The hidden rule changes after a run of correct answers; mistakes count, then play continues.

CORRECT0

ACCURACY—

AVG. SORT—

FASTEST—

READY?

DISCOVER THE SORTING RULE

Compare all three card features. Feedback is your only clue.

TARGET CARD

Touch or mouse: choose a category card · Keyboard: 1, 2, or 3. The active rule is never displayed.

HOW TO PLAY

Learn from feedback, then adapt

01
Compare the target with the three category cards by color, symbol shape, and symbol quantity.
02
Choose one slot. CORRECT or INCORRECT feedback helps you infer the hidden rule.
03
Keep testing your hypothesis: after consecutive correct sorts, the rule silently changes.

RULE DISCOVERY

Why can the same target fit different slots?

A target can match one category by color, another by shape, and the third by quantity. Only feedback reveals which feature currently controls the answer.

The rule stays stable long enough to form a hypothesis, then changes without an explicit announcement after consecutive correct sorts.

ENTERTAINMENT CHALLENGE

Not a clinical sorting test

This game is for entertainment and personal practice. It is not the Wisconsin Card Sorting Test or a validated measure of executive function.

Practice, strategy, display size, input method, and interruptions can all change results.

QUESTIONS

Card sorting rule game FAQ

What are the possible rules?

The hidden rule is one of three features: card color, symbol shape, or number of symbols.

Will the game tell me when the rule changes?

No. A silent switch is part of the challenge. Use new feedback to notice when your previous strategy stops working.

How is endless mode different?

The hidden rule switches after fewer correct sorts, the answer window shrinks, and one error or timeout ends the run.

Is this a clinical test?

No. It is a recreational rule-discovery game, not a medical or diagnostic assessment.