Can you solve the famously difficult green-eyed logic puzzle? – Alex Gendler

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One hundred green-eyed logicians have been imprisoned on an island by a mad dictator. Their only hope for freedom lies in the answer to one famously difficult logic puzzle. Can you solve it? Alex Gendler walks us through this green-eyed riddle.

Lesson by Alex Gendler, animation by Artrake Studio.

5 Comments

  1. @GrookeyPeacemaker July 5, 2026 at 9:17 pm

    TLDR of answer: confirm that everyone else knows what they don’t know everyone else knows

  2. What about “everyone you see around you has green eyes” hehe

  3. @Achildsproduction July 13, 2026 at 4:49 pm

    at least 99 of u have green eyes isnt new information cuz they could see each other

  4. @ghanasyamremesh949 July 17, 2026 at 1:01 am

    Why not say ‘atleast 99 of you have green eyes’? That way everyone will figure out they have green eyes on the second day right?

  5. If i was on an island with 99 other people who all had green eyes and i didn’t know mynown eye color, I’d just go ahead and assume

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