This is an online riddle with 51 levels. Search for clues, and change the URL to solve each level, good luck! 
Play Here
You need to register in order to play, but you can go through a trial part without registering to see how this riddle is, and then decide if you would like to register.
UPDATE: New levels will follow soon.
WARNING:
USE SPOILER TAGS TO GIVE HINTS.
DO NOT GIVE SOLUTIONS, POST FULL QUESTIONS, OR GIVE A LINK TO ANY PART OF THE GAME.
THIS IS HOW YOU MAKE SPOILERS
[spoiler=Title Here]Enter text here...[/spoiler]

Play Here
You need to register in order to play, but you can go through a trial part without registering to see how this riddle is, and then decide if you would like to register.
UPDATE: New levels will follow soon.
WARNING:
USE SPOILER TAGS TO GIVE HINTS.
DO NOT GIVE SOLUTIONS, POST FULL QUESTIONS, OR GIVE A LINK TO ANY PART OF THE GAME.
THIS IS HOW YOU MAKE SPOILERS
[spoiler=Title Here]Enter text here...[/spoiler]
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