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The Crypto Challenge Contest

375
Challenges
14,204
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 immortalized in the Hall of Fame.
Challenges in four levels

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

Recent solves
Cogite
Cogite

Solved Level 1 challenge Autokey Cipher

Cogite
Cogite

Solved Level 1 challenge M-138 — Part 1

Cogite
Cogite

Solved Level 1 challenge Cryptanalysis Hacking Puzzles — Part 2

Rotzpipn
Rotzpipn

Solved Level 1 challenge Number Sequence

Circle55
Circle55

Solved Level 1 challenge Number Sequence

Cogite
Cogite

Solved Level 2 challenge Alice's Birthday Party (Part 2)

Cogite
Cogite

Solved Level 2 challenge Alice's Birthday Party (Part 1)

Cogite
Cogite

Solved Level 2 challenge Cracking SHA1-Hashed Passwords

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:
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