Metal Gear Solid: Piece Walker was a flash-based jigsaw puzzle game that was released on January 28, 2010. The site for the game had been up for a few weeks prior to its release although the game was unplayable. Players who completed the game would unlock Metal Gear Solid: Peace Walker PSP wallpapers and other images along with new concept art of Raiden for what was then known as Metal Gear Solid: Rising.