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The Cipher Challenge Contest

378
Challenges
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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
Ron Stoner
Ron Stoner

Solved Level 2 challenge Monoalphabetic substitution with camouflage — Part 3

Ron Stoner
Ron Stoner
Ron Stoner
Ron Stoner

Solved Level 2 challenge Homophonic Encryption — Part 3

Ron Stoner
Ron Stoner

Solved Level 2 challenge Homophonic Encryption — Part 4

Ron Stoner
Ron Stoner

Solved Level 2 challenge Modified Vigenère Cipher

Ron Stoner
Ron Stoner

Solved Level 2 challenge Spanish Strip Cipher — Part 2

Ron Stoner
Ron Stoner
Ron Stoner
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