The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Assembly Point – Part 1
Solved Level 1 challenge Number Sequence — Part 4
Solved Level 1 challenge Number Sequence — Part 7
Solved Level 1 challenge Monoalphabetic substitution with camouflage — Part 4
Solved Level 1 challenge Letter from the Alleged Countess Julie von Ortenburg
Solved Level 1 challenge Music Code — Part 1
Solved Level 2 challenge Music Code — Part 2
Solved Level 2 challenge Handycipher — Part 1
Four degrees of difficulty, from pen & paper to complex mathematical problems