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The Cipher Challenge Contest

378
Challenges
14,722
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
Robert
Robert

Solved Level 2 challenge Assembly Point – Part 2

Luigi Tomelli
Luigi Tomelli

Solved Level 2 challenge Assembly Point – Part 2

klinsten
klinsten

Solved Level 1 challenge Factorization Cipher — Part 1

jgamblin
jgamblin

Solved Level 2 challenge Assembly Point – Part 2

Dr. René Bäder
Dr. René Bäder

Solved Level 2 challenge Assembly Point – Part 2

Dr. René Bäder
Dr. René Bäder

Solved Level 1 challenge A disguised code

Peter Uelkes
Peter Uelkes

Solved Level 2 challenge Assembly Point – Part 2

Dr. René Bäder
Dr. René Bäder

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