The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
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)
Solved Level 1 challenge Factorization Cipher — Part 1
Solved Level 1 challenge Number Sequence — Part 4
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Modular Sequences
Four degrees of difficulty, from pen & paper to complex mathematical problems