[TOMT] Browser game (circa 2004) that required you to do creative things on the site itself to reach subsequent levels like inspect element, parse the URL, etc.

In the height of popularity for Flash-based escape-the-rooms, I was playing a game in the same vein that I really loved. Instead of being visual, it was purely puzzles that you would solve creatively using aspects of the site itself. For some levels I'm sure there were also puzzles that presented more plainly, but those aren't what made it unique. I wish I could remember more, but I don't. I'm in a phase where I'm re-discovering games like Crimson Room and would love to find this game again! It was my favorite of the genre but I can't seem to find it anymore.