Shirobi Labs

Shirobi labs is a blog that explains various challenges (without giving away the answers). The site also provides many articles...

Created on 24.02.13 14:27 UTC+0

Hacking-Challenges is a German challenge site with challenges in 8 categories, tools, a forum, and much more.

Created on 15.01.13 19:51 UTC+0 provides many different kinds of challenges as well as tutorials for C++ and Java programming.

Created on 16.04.12 22:43 UTC+0