In this game you play a hacker. When you first log in to your hacking console you get an email from someone you don’t know, who asks you to do a hack for him because he heard great things about you. If you succeed, your name will become more known, and you will get more hacking assignments.
The assignments get harder along the game. To help you in your hacking adventure, you have a full featured hacking toolbox. You have tools like: ping, portscan, telnet, virus uploader, password hacker, file destroyer, etc.
The operating system used in the game is a mix of *NIX and MS-DOS, which I called ChaOs. It has some nice features, like a local filesystem (you can add your own folders), and much more cool stuff.
Check out the website for more info and the download here.