Hidden-rule investigation
What does the Black Box accept?
Study the examples, then test your own words. The same hidden rule is applied every time.
Your goal: do not guess the author's wording. Build enough evidence to predict what the machine will do with examples you have never seen.
✓ Accepted
The Black Box
Waiting for a test
✕ Rejected
Choose a deliberate test. Letters only; 2–24 characters. Real words are not required.
Untested evidence
0 remaining
Choose a word to send through the Black Box
The words are deliberately mixed. Their status is hidden until you test them.
Choose strategically. A useful test can separate two competing hypotheses.
Think like an investigator
The Black Box rewards useful experiments, not fast guessing.
1 · NoticeLook for properties shared by accepted examples and missing from rejected examples.
2 · TestChoose an example where competing ideas predict different outcomes.
3 · ProveWhen you think you know the rule, predict several unseen cases before the rule is revealed.