I have a game called Safecracker that is quite fun. It centered around Cryptology and Cryptanalysis. Problem is i have played it about 10 times over and already know the solution to most of the puzzles by heart. I also have played a game called Broken Sword: Shadow of the Templars. I am looking to find games that are similar to these two in the respect that they are puzzle solving and involve cryptology and cryptanalysis.
I cannot remember the names but I think there are several AA releases focusing mainly on today's hacking and stuff as spy games. If you google it as spy game etc, you may find some more titles. I will post some names if I can find as well.