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Outcry
Brain Teasers Lab
Choose a game. The rules, the story and the worked answer are all inside the game itself.
Game theory
Screwy Pirates
Five pirates split a hundred gold coins by vote. Lose the vote and you walk the plank.
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Induction
Tiger and Sheep
A hundred tigers and one sheep. Whichever tiger eats turns into a sheep itself.
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Game theory
The Split Deal
Two thieves, two rooms, one offer each - and no way to talk it over.
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Game theory
Stag or Hare
Two hunters, one stag that takes both of them, and one hare that doesn't.
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Game theory
One Offer, No Discussion
A hundred pounds, one proposal, and a partner who can burn it all.
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Game theory
The Growing Pot
Every time you pass, the money doubles - and the other player gets the chance to take it.
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Game theory
Two-Thirds of the Room
Everyone picks a number. The winner is closest to two-thirds of the average.
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Case reduction
One Seat in the Boat
A wolf, a goat, a cabbage, and a boat that only carries one of them.
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Probability
The Office Bet
Your colleague bets you two people in the office share a birthday. Do you take it?
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Conditional probability
The Third Door
You pick a door. The host opens another. Do you switch?
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Induction
The Line of Hats
A hundred prisoners in a line, each seeing only forwards, each guessing their own hat.
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Case reduction
The Rope Bridge
Four friends, a rotting bridge in the dark, and one torch between them.
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