G4.zip -

This specific file became a rite of passage for early internet detectives. It taught a generation of web users about: : How to peek behind the curtain of a webpage.

: On Level 4, the user had to check the source code to find a hidden link to g4.zip . g4.zip

: A hidden message appeared on the wall, providing the username and password needed to access Level 5. Legacy of g4.zip This specific file became a rite of passage

: Changing the address bar to navigate "forbidden" directories. : A hidden message appeared on the wall,

: Realizing that what you see on a screen is just a collection of data that can be manipulated.

The name "g4.zip" was a hint hidden within the page's source code. Players who figured this out were directed to a downloadable file containing a picture of a . The "informative story" hidden in this level is actually a lesson in steganography —the art of hiding information within other data. How the Puzzle Worked