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The Cipher Challenge Contest

376
Challenges
14,594
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
ufo260
ufo260

Solved Level 1 challenge Number Sequence — Part 2

ufo260
ufo260

Solved Level 1 challenge Original Caesar Cipher

Emanuele
Emanuele
Michel Van Caneghem
Michel Van Caneghem
Michel Van Caneghem
Michel Van Caneghem

Solved Level 2 challenge Homophonic Encryption — Part 4

Michel Van Caneghem
Michel Van Caneghem

Solved Level 2 challenge Homophonic Encryption — Part 3

Emanuele
Emanuele
Emanuele
Emanuele
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: