| The Book Code: A Challenge for Bookworms | 100 | Feb. 1, 2013, 5:20 p.m. |
| Multilingual Monoalphabetic Substitution | 150 | Feb. 1, 2013, 1:40 p.m. |
| ¿No Hablas Español? No problemo! | 100 | Jan. 25, 2013, 2:21 p.m. |
| How do you become a big cryptographer? | 100 | Jan. 22, 2013, 3:43 p.m. |
| Factorization Cipher — Part 1 | 100 | Jan. 22, 2013, 2:10 p.m. |
| Letter to the Templars — Part 2 | 101 | Jan. 18, 2013, 5:34 p.m. |
| Letter to the Templars — Part 1 | 101 | Jan. 18, 2013, 3:04 p.m. |
| Playfair with hints about the grid | 133 | Jan. 18, 2013, 2:17 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Jan. 18, 2013, 10:57 a.m. |
| Number Sequence — Part 3 | 100 | Jan. 18, 2013, 10:34 a.m. |
| Beaver Code | 101 | Jan. 17, 2013, 10:01 a.m. |
| Monoalphabetic Substitution | 100 | Jan. 16, 2013, 5:40 p.m. |
| Original Caesar Cipher | 100 | Jan. 16, 2013, 11:45 a.m. |
| Number Sequence | 100 | Jan. 16, 2013, 11:33 a.m. |