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The Cipher Challenge Contest

380
Challenges
15,095
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
Loukia
Loukia

Solved Level 1 challenge Number Sequence

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Loukia

Solved Level 1 challenge Modified Caesar Cipher

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Loukia

Solved Level 1 challenge Original Caesar Cipher

LeonidasPoulianos
LeonidasPoulianos

Solved Level 2 challenge Cracking SHA1-Hashed Passwords

JoeMac4
JoeMac4

Solved Level 1 challenge A disguised code

Zoi Chrysanthakopoulou
Zoi Chrysanthakopoulou

Solved Level 1 challenge Original Caesar Cipher

Zoi Chrysanthakopoulou
Zoi Chrysanthakopoulou

Solved Level 1 challenge Advent-Challenge — Part 1

LeonidasPoulianos
LeonidasPoulianos

Solved Level 1 challenge Number Sequence — Part 2

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