Sony's Rain is a game you've probably forgotten, and yet if it manages to live up to the firm's recent digital output it will surely be one of 2013's most memorable.Briefly announced at Gamescom 2012 and then buried underneath a quarry of more glitzy announcements, Rain is the latest from Japanese team PlayStation C.A.M.P.As the creator of two of PSN's most unique titles Tokyo Jungle and Echochrome, the single-player action adventure already carries the weight of expectation. Factor in the exceptional quality of last year's BAFTA-winning digital line-up, and you might not be surprised if the developer may even be feeling a little pressured to live up to PSN's newfound reputation.