[UPDATE: Jonathan has now posted on the official Braid blog a step-by-step guide on how to go about creating your own Braid levels. Huzzah!]

Jonathan Blow has confirmed the rumour that there is indeed a map editor for the PC version of Braid.

Some gamers with a little too much time on their hands had noticed that there is a parameter '-editor' which puts Braid into a sort of editor mode with the press of the F11 button.

Now Blow has posted on the Steam forums, explaining that there is indeed a way to make your own puzzles:

"After I get a new version out in a few days that fixes the problems some people are having, and when more people have played/finished the game, I am going to post some documentation for the editor. The way it works is you can make levels with the editor (up to a full game, potentially) and run that with -universe later... also a tool will be released that lets you take Photoshop files and import them into the game, if you want to put new graphics in your levels."

He then reveals that he'll be releasing "a little kit" soon for owners of the game to create their own worlds, complete with replaced sounds, levels and graphics.

David Hellman even appears to have screenshots of the editor in action on his blog, titled 'Developer Mode'. Pretty exciting stuff. I'm sure we can expect a barrage of user-created maps extremely soon.