The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge New Year's Greetings — Part 3
Solved Level 1 challenge Playfair with hints about the grid
Solved Level 1 challenge Pigpen with a twist — Part 1
Solved Level 1 challenge Double Columnar Transposition
Solved Level 1 challenge New Year's Greetings — Part 2
Solved Level 1 challenge Molehunt (Part 2/3)
Solved Level 1 challenge Number Sequence — Part 3
Solved Level 1 challenge Molehunt (Part 1/3)
Four degrees of difficulty, from pen & paper to complex mathematical problems