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The Cipher Challenge Contest

376
Challenges
14,452
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
jgamblin
jgamblin

Solved Level 1 challenge Number Sequence — Part 7

jgamblin
jgamblin

Solved Level 1 challenge Modular Sequences

jgamblin
jgamblin

Solved Level 1 challenge ECDH-Key Exchange for Beginners

jgamblin
jgamblin

Solved Level 1 challenge Zodiac Cipher

jgamblin
jgamblin

Solved Level 2 challenge The SIGABA Challenge — Part 1

Szabados Péter
Szabados Péter

Solved Level 1 challenge A hidden word

Bor Gergő Tétény
Bor Gergő Tétény

Solved Level 1 challenge Image Noise

Bor Gergő Tétény
Bor Gergő Tétény

Solved Level 1 challenge Letter to the Templars — 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: