There have been a lot of epic plot twists which change the entire story this way in film, the Sixth Sense being a classic example, but very few quite as cerebral as this one. Do you know any films/games/stories with similar plot twists you'd like to recommend to fans of the game? Please be sure to use spoiler tags when you get to describing the plot twists, though it'd be nice if you could include enough information about the film to get people interested enough to want to watch the film in question.
I'd like to mention two...
Shutter Island
After describing the plot of Shattered Memories to my girlfriend, she looked gobsmacked, and said "You HAVE to watch Shutter Island! I can't tell you why because it'll spoil it, but seriously, just watch it!"...
This film has so many resemblances to Shattered Memories that I would suspect that it was an inspiration for the game if it hadn't come out around the same time as it. Leo DiCaprio plays detective in 1954, Edward Daniels, sent to find a missing patient from an institution for the "criminally insane". He took the job because Andrew Laeddis, the arsonist responsible for the death of his wife, is said to be there. As he gets closer to the truth he experiences bizarre dreams and things start to become very weird.
Mulholland Drive
This is a stunning film! David Lynch really works his magic here. This one presents a dramatic plot twist without having to spell it all out to you. Guaranteed it needs repeated viewings to 'get it', but the clues are all there.
Betty (Naomi Watts) has just moved to Hollywood to attempt to start an acting career. She's damn good, and looks to be going far, but when a girl with no memory (Laura Harring) shows up with a purse containing a wedge of cash and a blue key, she turns her focus to helping this girl (whom they dub 'Rita') find out her identity, and the origins of the money and the key. Whenever they get closer to Rita's identity, something odd seems to happen (much like the way the world ices over every time Harry Mason comes close to finding his origin), and there also seem to be mafia-types forcing a director to put actress Camilla Rhodes in a role Betty was after. Betty and 'Rita' fall in love and sleep together, and visit an art house theatre club called 'Silencio' in the middle of the night, where things start to get very strange...
There is no Betty, and Rita was actually the actress, Camilla Rhodes. Betty is really Diane Selwyn, a failed actress struggling to make ends meet, and her fuckbuddy Camilla had been helping out by getting her minor roles in her films. Diane had fallen madly in love with Camilla, though, and Camilla had to sever the intimate ties between them since she was in a relationship with the director of their film. Desperate, distraught and furious, Diane had met a hitman and put a hit on Camilla and the director, the hitman informed her that he would leave a blue key for her to let her know that the deed had been done.
The rest of the film had been the vivid dream of a person overcome with their own guilt. Betty was her dream-self, succeeding in Hollywood, and the dream version of the woman she loved was what she wanted from her, submissive and helpless, in desperate need of her. The dream version of an actress named Camilla Rhodes got her part for any reason but the fact that she was actually better than her, such as mafia-types threatening the director. The money in Rita's purse was the money Diane gave to the hitman, and the blue key was the hitman's signifier.
After her dreams, hallucinations, and overwhelming regret overcome her, Diane takes her own life.