Indie platform and puzzle game in which the hero (Tim) will try to rescue his princess.
Note that Braid has an excellent storyline that the player can read in (at least) 2 different ways.
One theory, based on the inclusion of a hidden event and the famous quotation stated by Kenneth Bainbridge after the detonation of the first atomic bomb—"Now we are all sons of bitches"—is that the princess represents the atomic bomb and Tim is a scientist involved in its development. Some also refer to the name of the game as both reference to the hair braid of the princess Tim seeks as well as the intertwining of time, demonstrated by the various time mechanics explored in the game.
Source: Wikipedia article about Braid