| A hidden word | 100 | Feb. 25, 2016, 12:29 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | April 7, 2015, 11:29 a.m. |
| M-138 — Part 1 | 101 | April 7, 2015, 10:48 a.m. |
| Trifid Cipher | 100 | March 31, 2015, 1:37 p.m. |
| Number Sequence — Part 7 | 113 | March 30, 2015, 1:25 p.m. |
| From Russia with Love | 100 | March 30, 2015, 12:23 p.m. |
| Snow White and the seven dwarfs | 103 | May 28, 2013, 12:24 p.m. |
| Letter to the Templars — Part 2 | 102 | Oct. 2, 2012, 9:14 a.m. |
| Letter to the Templars — Part 1 | 101 | Oct. 2, 2012, 8:34 a.m. |
| Number Sequence — Part 2 | 100 | Sept. 28, 2012, 9:31 a.m. |
| Grille Cipher | 100 | Sept. 28, 2012, 8:49 a.m. |
| Beaver Code | 102 | Sept. 28, 2012, 7:39 a.m. |
| Factorization Cipher — Part 1 | 100 | Sept. 27, 2012, 3:08 p.m. |
| Number Sequence — Part 4 | 101 | Sept. 27, 2012, 11:29 a.m. |
| Number Sequence — Part 3 | 101 | Sept. 27, 2012, 10:58 a.m. |
| How do you become a big cryptographer? | 101 | Sept. 27, 2012, 10:23 a.m. |