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The Cipher Challenge Contest

380
Challenges
14,955
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
G. W.
G. W.

Solved Level 1 challenge Modular Sequences

msz009
msz009

Solved Level 1 challenge Assembly Point – Part 1

tamisrah
tamisrah

Solved Level 1 challenge Double Columnar Transposition

Aliazer
Aliazer

Solved Level 2 challenge "The Road" — Part 1

G. W.
G. W.

Solved Level 1 challenge Autokey Cipher

msz009
msz009

Solved Level 1 challenge MACs in Orbit

Snake
Snake

Solved Level 2 challenge The Impatient Notary

Dropflux
Dropflux

Solved Level 2 challenge Hill Cipher

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