Learn more by checking out these great sites.
The Bandit wargame is aimed at absolute beginners. It will teach the basics needed to be able to play other wargames. Bandit will challenge you to use a wide range of GNU/Linux commands to solve challenges. This game, like most other games, is organised in levels. You start at Level 0 and try to “beat” or “finish” it. Finishing a level results in information on how to start the next level.Visit Website
Learn more about GNU/Linux with these hands on challenges. This wargame doesn't require any knowledge about programming - just a bit of common sense and some knowledge about basic \*nix commands.Visit Website