Valve today announced that the PC version of Braid will be released via Steam digital distribution platform on March 31. Developed by Number None, Braid is an artful puzzle-platformer where challenging, yet accessible puzzles are solved by manipulating time. Time behaves differently in each world, and every puzzle shows you something different about the world. The time behaviors include rewinding, independent time streams, time that is tied to space, parallel realities, time dilation, and perhaps more.