Activating the game's Outerworld services and submitting a score in the Lightning Returns demo will give players access to the Siegfried outfit that can be used in the full game, Square Enix adds.
A PlayStation 3 version of the demo will be released on the PlayStation Store today in North America, with a release in Europe following tomorrow.
GameSpot's Kevin VanOrd recently posted his impressions after playing an early build of Lightning Returns. "Lightning Returns is chock full of prophecy talk, though I have yet to put all of its jumbled pieces together into a coherent whole," he wrote.
Lightning Returns: Final Fantasy XIII will be released on February 11 for Xbox 360 and PlayStation 3.