Each round you guess a hidden bit — 0 or 1 — 100 times. A hit is when your guess matches the target; a miss is when it doesn't. There's no skill and no mistake: guessing is guessing.
One shared, committed target a day. Everyone predicts the same one. It's the clean measurement: blind, once a day, no opponent.
A duel: you and another person guess the same target; most hits wins. Find an opponent any time. Only matches we assign count toward your record, so it's a fair test.
Why it matters: one session is noise (everyone lands near 50%). Across thousands of guesses, though, we can ask a real question — can a person beat another more than chance allows? At 100 decided matches, about 62 wins would be a genuine result. This is competition, not the Lab's falsification work — but it's a real question, and your matches are the data.