The recently released PC version of Number None's time-shifting platformer Braid comes with an unexpected surprise: a built-in level and graphics editor. Developer Jonathan Blow says documentation and a developers kit is due shortly.

Blow confirmed that the PC version—and, eventually, the Mac version—comes with an unannounced editor, allowing players to swap out graphics, sound and level designs. The developer says budding Braid designers can custom make "up to a full game, potentially" with built-in tools.

And when he says "full game," he obviously means a brick-by-brick recreation of Super Mario Bros. level 1-1.

Map editor for Braid? [Steam Forums via Destructoid]