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The Cipher Challenge Contest

378
Challenges
14,836
Active members
You like riddles? Then this is your place!
MysteryTwister is a cipher contest, where you can solve cryptographic riddles (challenges) of different difficulty levels. If you are successful, you will be inducted into the Hall of Fame.
Challenges in four levels

Four degrees of difficulty, from pen & paper to complex mathematical problems

Recent solves
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chinafish

Solved Level 3 challenge The Heavy T52 Sturgeon Challenge — Part 1

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chinafish

Solved Level 3 challenge ORYX Stream Cipher — Part 4b

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chinafish

Solved Level 2 challenge ORYX Stream Cipher — Part 4a

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chinafish

Solved Level 2 challenge The SIGABA Challenge — Part 2

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chinafish
chinafish
chinafish

Solved Level 2 challenge The SIGABA Challenge — Part 1

chinafish
chinafish

Solved Level 3 challenge Handycipher — Part 5

chinafish
chinafish

Solved Level 3 challenge Handycipher — Part 6

Learn, Hack & Connect

Solve challenges and connect with other users on Discord

Challenges in four levels

Four degrees of difficulty, from pen & paper to complex mathematical problems

Enter the Hall of Fame

Master challenges in four levels and secure your spot in the Hall of Fame

Start exploring the challenges

Our 7 most solved challenges