You have to look for clues that will help you advance to the next level. Here are the rules and instructions:

1. Main hints are always found in the source (Ctrl + U). Remember, S-O-U-R-C-E.

2. DON'T tell solutions to anybody. Really.

3. DON'T use capital letters, because all files are lower-case letters. Passwords are exceptions.

4. All pictures are in .jpg format.

5. Only give hints to others, not solutions.

6. In order to solve some levels, you may need to download some third party programs, but don't worry: They all are free.

7. Remember to put ".htm" after the solution. Like "solutionhere.htm". Put it in the addressbar.

8. Have fun torturing yourself.

If you don't understand the instructions, please try this Tutorial. It should help.