War Games for Beginners 

Hackers Lab

An excellent War Game for begginers that is hosted in Korea.

Hackergames.net

A comprehensive list of hacking and security related challenges, hackits, wargames, tools, and tutorials, along with user reviews.

Hackthissite!

Hack This Site is a free, safe and legal training ground for hackers to test and expand their hacking skills. More than just another hacker wargames site, we are a living, breathing community with many active projects in development, with a vast selection of hacking articles and a huge forum where users can discuss hacking, network security, and just about everything.

Try2hack

A war game for intermediate level hackers.

Online hacking tutorials for beginners 

Guide to (mostly) harmless hacking

Lots of entertaining, factual, and downright hairy guides to information that you won't find in computer manuals!

Learn to Hack Computers Legally 

The Happy Hacker: A Guide to (Mostly) Harmless Computer Hacking

by Carolyn Meinel

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Uberhacker!: How to Break Into Computers with CDROM

by Carolyn P. Meinel

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Uberhacker II: More Ways to Break into a Computer

by Carolyn Meinel

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