I think you understood me wrong, I mean that it is useless crap for anyone older than 14.
A couple years ago I found that site... I tried some of the stuff on it but either it didn't work or it was completely useless.
If you want to learn about security, you would do better to spend time on AO reading tutorials and asking questions, setting up a Linux box and learning about it, and maybe learning a programming language if you already haven't. I think you will learn a lot more doing this than you would performing trivial tasks that make you feel like you are actually hacking.