Mind Games
Mind Reader
Everyone secretly picks a number from 0 to 100 — and the round’s QUESTION decides who wins: closest to ⅔ of the average, the most popular number, the lowest unique one, the smaller crowd… ELEVEN questions plus a mix mode, and every one needs a different kind of mind-reading, because the right answer always depends on what everyone ELSE picks. Five rounds on the projector and your class will discover something remarkable about thinking-about-thinking. Practice solo against the adaptive Robo-Class.
For Educators
Built for the classroom
Strategic reasoning and theory of mind — the famous “⅔ of the average” game from behavioral game theory. Students discover iterated reasoning by LIVING it: round 1 lands near 33, then the class talks itself down the staircase, round after round, toward the mathematical bottom. The game never lectures — the histogram between rounds does the teaching, and the final “staircase” chart shows the class their own collective reasoning. Submissions are private (only WHO has answered shows, never what) and revisable until the reveal.
Grades 5+ · 3, 5, or 7 rounds (5 recommended). Best with 6+ players; works with any number. 10–15 minutes for a full game including discussion.
Three ways to play
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Practice solo
The Robo-Class: 8 robots that reason at different depths and ADAPT each round. To beat them you must aim where the class is GOING, not where it was.
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Host on the projector
Open a room; a 4-letter code + QR + join link appear. Names light up as students lock in — numbers stay secret until the reveal.
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Join on any device
Students pick 0–100 and can change their number until the reveal. Closest to ⅔ of the average earns +3 (exact ties all win); within 3 earns +1.
Run a live class in 5 steps
- Open the Room — choose rounds (5 is the sweet spot) and auto or manual reveal.
- Share the code / QR / link; students join on any device.
- Round 1: everyone picks, the histogram drops, the ⅔ target sweeps in. Resist explaining anything.
- Between rounds, just ask: “what will everyone do NOW?” — and watch the targets fall.
- After the last round the STAIRCASE appears: every round’s target, descending. Now ask the class where it would stop if they played forever.
Tip: host on a laptop or projector (the big screen shows the code, QR and leaderboard); students join on their phones or laptops.
