Questions tagged [keys-and-locks]

For puzzles about using keys to open locks and doors.

For puzzles about using keys to open locks and doors. Examples include:

(i) Minimizing the number of keys required when strategically spread amongst different people (e.g. The Puzzle of the Locked Box).

(ii) Finding the correct permutation of keys to open a set of locks (e.g. Key and lock puzzle).

21 questions

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6 answers

Do you have my spare key?

I have three bicycle locks, ones like this: Because they look so much alike I etched a unique number into each lock and the same number into the keys that unlock it. Unfortunately I seem to have lost all my spare keys! (That also have the…

keys-and-locks

asked Mar 23 '18 at 12:37

Peter

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1 answer

Out Of Bounds Puzzle [Level !]

Unlock the lock with the key. You might want to put this next to a certain website's url. It was a gift to another website, if you've read it before. /a/8QemVeM Is enough said already? Complete the…

keys-and-locks

asked Jun 25 '19 at 12:59

Enqrypted - Deviniled

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2 answers

Is my childrens' answer a correct one to this puzzle?

On another SE site (here ) I found the following puzzle. Suppose we have, say, a hundred open locks, numbered from 1 to 100. The riddle is the following: you hold a key which opens one of the locks. However, the keys are numbered as well: if you…

keys-and-locks

asked Mar 28 '18 at 12:09

Sentinel

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