is played by solving physical puzzles in a somewhat standard video game environment like Super Mario Bros. with jumping and enemies. This is made innovative by the player's ability to reverse time and "rewind" one's actions, even after dying. Complicated puzzles result from features like objects that don't rewind with the rest of the universe and "ghosts" of the player's actions before rewinding.

Author : http://www.davidhellman.net/blog/the-art-of-braid-part-3
http://braid-game.com/news/
Wikipedia: http://en.wikipedia.org/wiki/Braid_%28video_game%29