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The Cipher Challenge Contest

376
Challenges
14,598
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 10

ufo260
ufo260

Solved Level 1 challenge Number Sequence — Part 9

Orhun Tekin
Orhun Tekin

Solved Level 1 challenge Original Caesar Cipher

Michel Van Caneghem
Michel Van Caneghem

Solved Level 3 challenge Vinaigrette Signature Scheme

ufo260
ufo260

Solved Level 1 challenge A hidden word — Part 2

xiaozhuan
xiaozhuan

Solved Level 2 challenge BCR code (Book-Caesar-RSA)

ufo260
ufo260

Solved Level 1 challenge Number Sequence — Part 8

ufo260
ufo260

Solved Level 1 challenge Number Sequence — Part 6

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: