A sequence of colored shapes follows a hidden rule (e.g., "alternate red/blue, every third is green"). You see some of the sequence. Predict the next item. We start with simple rules and increase complexity until you miss.
What makes this one different
We fit a personal rule-difficulty curve — your accuracy vs. rule complexity. That curve is more informative than a single "max level reached" number.
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Rule induction — figuring out the hidden rule that generates a sequence — is one of the core components of fluid intelligence. The classic "find the next number" puzzles tap into it. We provide a parameterized version where rule complexity grows in a controlled way.
Accuracy curve: where does it drop? That's your rule-complexity ceiling. Most adults plateau around complexity 5–6.
Yes — after each trial, if you miss, we reveal the rule. That's the best way to learn pattern recognition.
Not directly. We don't time trials. If you need time to think, take it — the score reflects accuracy, not speed.