http://scifi.pages.at/hackits/ has a series of tests or levels to see how good your logic or knowledge with the web is. No, it's nothing bad, I know it has the word hackits in it but it's nothing bad. What it is is a site that tests how much you can figure out or "hack" on the site. You try to figure out the passwords that are in the source code. There are a series of levels, and this site made this area for that reason, to try to "hack" your way to the top. Give it a try, it's very addicting!