### sick of studying?

- what if?
- Famous unsolved codes and ciphers – You could be the first!
- Dictionary of Numbers
- Paper Enigmas: Pringles Can, Wallet-ring, another tube, strips
- Buy Secret Decoder Rings
- xkcd
- miscellaneous fun cryptography things

- what if?
- Famous unsolved codes and ciphers – You could be the first!
- Dictionary of Numbers
- Paper Enigmas: Pringles Can, Wallet-ring, another tube, strips
- Buy Secret Decoder Rings
- xkcd
- miscellaneous fun cryptography things