Straight from 1up:

Level Editor Hidden in PC Version of Braid

Jonathan Blow confirms the editor, and also promises a tool to import images for custom levels.

By Kris Pigna, 04/14/2009

It may be a couple of days late, but this still has to be one of the cooler Easter eggs we've seen in a long while. In a post on the Steam forums, Braid creator Jonathan Blow has confirmed there's a hidden level editor in the recently released PC version of his time-bending platformer (via Destructoid).

Blow posted the reply in a thread questioning whether a level editor was in fact hidden in the game, saying that he'll release details about the editor at a later date. "Yeah, 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," he wrote. Blow also revealed the level editor could be used to make "up to a full game, potentially," and that he'll also release a tool that'll allow players to import Photoshop images into the game, to add fresh and original graphics to the custom levels.

If you want to get a crack at fooling around with the editor now, you can scan the thread for multiple posts about how to get it working, and even how to save your files. It seems a little bit unwieldy, but Blow promises the "little kit" he'll soon release "makes this easier."

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GG

Cool I just bought it yesterday. Running low on reasons to get a 360.

pretty cool

cool, though i don't see how I would want to mod this already wicked game.

More amazing levels?

because it lasts little more than 2 hours?

I was starting to think 15 dollars was a bit too much for this one, but with the level editor I'll reconsider it.

in other kinda related news: Mirror's Edge is apparently the latest UE3 game that people managed to get the editor running (need some UT3 files though)