MysteryTwister
Crack cipher challenges from pen-and-paper puzzles to hard cryptanalysis
MysteryTwister is a cipher contest with hundreds of cryptographic riddles. Each challenge gives you a ciphertext and a story, and you work out the method and the key to recover the solution. Solvers are added to a hall of fame.
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About MysteryTwister
It trains classical and modern cryptanalysis. The four difficulty levels run from pen-and-paper puzzles to problems that need real mathematics and your own code, so it suits beginners through experts.
It runs in the browser, and the CrypTool tools are a natural companion. An account records your solves.
On Breakpoint since 25 Oct 2026.
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