A self-hosted security challenge: 11 levels, each hiding a secret somewhere you'll have to go find. Solve one to unlock the next.

Every secret can be found by investigating what's actually in front of you. None of them require brute-forcing — if you find yourself scripting a guesser against the answer form, you're on the wrong track (and repeated wrong guesses will get you rate-limited anyway).

This is for educational purposes only. Don't point these techniques at anything you don't own or have explicit permission to test.