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The Cipher Challenge Contest

378
Challenges
14,744
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
Krishie Ramnath
Krishie Ramnath

Solved Level 1 challenge Autokey Cipher

FliegendeWurst
FliegendeWurst

Solved Level 1 challenge Number Sequence

Gilgamesh
Gilgamesh

Solved Level 1 challenge Number Sequence

Kyu
Kyu

Solved Level 1 challenge Number Sequence — Part 6

Kyu
Kyu

Solved Level 1 challenge Number Sequence — Part 5

Martin Pescador
Martin Pescador

Solved Level 3 challenge CMEA 2

Jinx
Jinx

Solved Level 2 challenge Factorization Cipher — Part 2

Jinx
Jinx

Solved Level 2 challenge Unconcealed RSA messages

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