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The Cipher Challenge Contest

376
Challenges
14,630
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
Michel Van Caneghem
Michel Van Caneghem

Solved Level 2 challenge Polyphonic Substitution Cipher — Part 1

Michel Van Caneghem
Michel Van Caneghem
jgamblin
jgamblin

Solved Level 3 challenge The SIGABA Challenge — Part 5

G0rger
G0rger

Solved Level 1 challenge Beaver Code

G0rger
G0rger

Solved Level 1 challenge Caesar Encryption

G0rger
G0rger

Solved Level 1 challenge Number Sequence — Part 2

G0rger
G0rger

Solved Level 1 challenge Original Caesar Cipher

G0rger
G0rger

Solved Level 1 challenge Number Sequence

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: