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6th Grade · Three Doors

Eleven is the year to find out that your gut is confidently, repeatably wrong — and that thirty tally marks settle an argument faster than an hour of shouting.

Full screen — no distractions

Where this goes

The ladder

The same idea, three times, roughly a year apart. This is what depth looks like from the outside.

  1. This year

    Three doors, played thirty times.

  2. Next year

    A hundred doors, where the host opens ninety-eight. The same puzzle with the fog removed.

  3. The year after

    Conditional probability — the grown-up name for who knew what, and when.

What lives on the desk this year

  • Three cups and something worth hiding
  • A tally sheet
  • A partner who will argue with you
  • A notebook for predictions written before the result
  • One rule: the guess goes down on paper first

All twelve years

A tower that has to stay up while you count to ten, at three. A proof that no list can contain the real numbers, at fifteen. Same practice, twelve sizes.

Last updated: September 2026

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