Play · Identification

Spot the Bias

You’re handed a published-looking research setup — data, question, regression spec, claimed finding. Your job is to name the dominant identification flaw before the next referee does. 25 puzzles in the bank, 10 bias families to learn.

Fields

Tap to include or exclude. Pool: 25 of 25 puzzles match.

Difficulty cap

How it works

Eight puzzles per round, sampled from your selected fields.
Each puzzle gives you a data source, a regression spec, and a claimed result.
Four bias options — pick the one that dominates the story.
After you submit, you see why, and what design would identify the effect cleanly.

Ready: 8 puzzles queued.