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The Crypto Challenge Contest

372
Challenges
13,761
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
miraisoraci
miraisoraci

Solved Level 2 challenge AES key — encoded in the machine readable zone of a European ePassport

wood
wood

Solved Level 2 challenge AES key — encoded in the machine readable zone of a European ePassport

ggg
ggg

Solved Level 1 challenge Advent-Challenge — Part 1

Kenma
Kenma

Solved Level 1 challenge Autokey Cipher

Kenma
Kenma

Solved Level 1 challenge Number Sequence — Part 8

Raven
Raven

Solved Level 2 challenge Alice's Birthday Party (Part 1)

YesongFang
YesongFang

Solved Level 2 challenge Alice's Birthday Party (Part 2)

Snake
Snake

Solved Level 2 challenge The Hutton Cipher – 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:
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