lets all work together, when you beat a level JUST POST HOW YOU DID IT!!! not the answers!!!
LEVEL 1: view the source of the document, in IE, to to view, then view source. search the top of the code and it will tell you the password.
LEVEL 2: open notepad, and open the url for the flash file.
http://www.try2hack.nl/levels/level2.swf just copy and paste that into notepade to open it. you will then see a whole bunch of garbage, but the U/P are in there.
LEVEL 3: there is a line at the top that says <script src="JavaScript"></script>
if you put JavaScript into the url.
http://www.try2hack.nl/levels/JavaScript you get the user and password and you see the password= and correct site and wrong site = stuff that the script on the lvl 3 page was pulling the info from.
LEVEL 4: get a java decompiler and openned the .class file in it, somewhere in there it will says "level4" well that is a file.
http://www.try2hack.nl/levels/level4 if you view the source on that page it will tell you everything. BobOmega (with blazer's help i think) is a 1337 H4x0r
LEVEL 5: I quit