After seeing all of the recent interest in "Hacker" Game Challenges, or Online Securit Challenges, I decided to create a list. Some of these are lists themselves, and many of them were found on Google. Zebulun from Cyberarmy is highly recommended.

Cyberarmy.com
HackerGames.net
http://www.techno-in-1.com/internet-...challenges.htm
http://www.techno-in-1.com/internet-...e-internet.htm
http://neworder.box.sk/codebox.links.php?key=elfchall
http://neworder.box.sk/codebox.links.php?key=36581


These are just a few, but I encourage other people to post their own onto here. Towards the end, we'll sort and compile them all into one big list.