Dark Souls is a 2011 action role-playing game developed by FromSoftware and published by Namco Bandai Games. A spiritual successor to FromSoftware's Demon's Souls, the game is the first in the Dark Souls series. From Wikipedia
Former PlayStation executive Shuhei Yoshida reveals that Sony's mishandling of Demon's Souls led FromSoftware to seek a new publishing partner for Dark Souls.