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The Cipher Challenge Contest

378
Challenges
14,739
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
upsidedown
upsidedown

Solved Level 1 challenge Number Sequence — Part 3

Jinx
Jinx

Solved Level 2 challenge Assembly Point – Part 2

upsidedown
upsidedown

Solved Level 1 challenge Beaver Code

upsidedown
upsidedown

Solved Level 2 challenge Cracking SHA1-Hashed Passwords

Emanuele
Emanuele

Solved Level 2 challenge Assembly Point – Part 2

Martin Pescador
Martin Pescador

Solved Level 2 challenge CMEA 1

Jin
Jin

Solved Level 1 challenge Assembly Point – Part 1

Martin Pescador
Martin Pescador

Solved Level 3 challenge Elliptic Boogaloo – Part 3

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