Think you've got what it takes to become root and beat all the levels? Each level you encounter will get more difficult, and the challenges will push your skills to the limit. There are hidden messages and puzzles scattered throughout all the levels, so if you do get stuck moving forward, then go back to where it all began. Solve them, and you'll gain access to the next level.
Your ultimate goal is to gain root access on a server. As you progress through the levels run:
touch ~/<yourname>
And then exit. Once you've completed all the tasks, you'll be invited to the second round of games if interested.
Start here. Good luck... and remember, everything is a clue.