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100 Brainteasers

One hundred puzzles, five levels, no multiple choice - you type the answer. Logic and deduction, numbers, lateral thinking and practical problems. Every one has a hint if you get stuck and a full worked solution when you are done arguing with it.

Solved 0 / 100

Without a hint 0

How it works

Pick any puzzle, in any order. Nothing is locked.
Type your answer. Spelling, wording and units are forgiving - "7", "seven" and "7 minutes" all count.
A hint is always there. Taking one still counts as solved, just not as a clean solve.
Progress is saved on this device only. No account, nothing sent anywhere.

Are the answers right?

Every answer that a computer can check was recomputed from scratch before this page was built: the bridge crossings and the jug pouring by exhaustive search, the pirates by backward induction, the prisoners and the broken stick by simulation, Cheryl's birthday, the fish riddle and the impossible puzzle by constraint solving. 66 of the 100 are machine verified.

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