The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge The Josse Challenge – Part 2
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge Number Sequence — Part 8
Solved Level 2 challenge The Josse Challenge – Part 1
Solved Level 2 challenge A Cloaked Substitution Cipher — Part 1
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 5
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 4
Solved Level 2 challenge Enigma Part 2
Four degrees of difficulty, from pen & paper to complex mathematical problems