1. Clicking on things will never help you, seriously.
2. Put your answer in the URL. addanswerhere.htm. There will never be a time when you will have to change the folder. The folder will only change after you have submitted a username/password.
3. In a case where you have to find a username/password, most of the time, you will find 2 words that are close to each other. You can tell if you see !--UN/PW-- with <> in the source. To enter it in the URL, you put in username_password.htm
4. In other levels, you'll have a Google bar. That means you will need Google to solve those levels.
5. Last but not least... NEVER CHEAT!!! Asking for hints is fine, but cheating I will not tolerate.
Important Tips:
1. Use anything and everything to help you solve the riddle (except walkthroughs). Every level has a logical reasoning to it. Brute force is never necessary!