The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level X challenge The Vatican Challenge — Part 4
Solved Level 2 challenge Extended Handycipher — Part 3
Solved Level 2 challenge Extended Handycipher — Part 2
Solved Level 2 challenge Extended Handycipher — Part 1
Solved Level 2 challenge Handycipher — Part 10
Solved Level 3 challenge Handycipher — Part 9
Solved Level 3 challenge Handycipher — Part 8
Solved Level 2 challenge The SZ42 Challenge — Part 6
Four degrees of difficulty, from pen & paper to complex mathematical problems