http://www.pouetpu-games.com/index.php? ... &game_id=1
It's not official, though...
Anyway, in this game you can make your own levels and share them online. However, there's some requirements to them, which you'll see when you're about to upload a level. Oh, and to get your level's code you have to finish and test then go to "Codes" and copy it so you can paste the code in that one box thing you need to upload it.
(Uploading link is at the bottom of the level portal.)
Oh, and I'm LOLER, where I've already made two levels.