The Challenges

The Challenges are contained in 4 levels:

• Level 1 is an introduction. Suitable for primary students, and anyone who wants to start at the beginning. This should be a fun way to get started.
• Level 2 contains more traditional ciphers, but you'll find the keys relatively easily. Some work is still required!
• Level 3 may keep some of the keys hidden. You might actually have to crack some ciphers here.
• Level 4 is designed to be really challenging, but contains some of the most imporant ciphers used today and in recent history.