International School Code Breaking Challenge

We’re now running a huge school code breaking competition. There are a total of 7 competitions to enter – each one with a number of codes to crack. Each time a code is cracked this gives the password to access the next clue. Students who break all codes will be entered onto the leaderboard of fame. Levels of codes range from upper KS2 to post 16 – so there should be something for everyone.Choose your level, and good luck!


Level 1: Easy, Age 11-16. This is intended to be a gentle introduction to code breaking. Hints provided throughout.


Level 2: Easy, Age 11-16. This builds on some of the skills from the Level 1 code and includes a mixture of common codes, from Morse Codes to substitution ciphers.

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Level 3: Murder mystery, Medium, Age 11-16. A murder has been committed in the Maths Department! Solve the clues to uncover the murderer, the weapon and the room.
Level 4: Murder mystery, Medium, Age 11-16. Another murder has been committed! Who can solve it first?


Level 5: Medium, Age 11-16. This level combines knowledge of a variety of codes and methods of solving them. Caesar shifts, transposition codes and more.


Level 6: Hard, Age 15-18. This is a real tough challenge – not for the faint hearted! It is primarily aimed at post 16 students and you can expect to look at binary codes, RSA codes and modulo arithmetic.
Level 7:  Hard, Age 15-18
Level Extra: Easy, Age 11-16. A bonus code breaking challenge in case you solve all the others!

Choose which level you want to attempt. Winners will be entered onto the leaderboard of fame. Good luck!