4. Shadow of the Colossus
Most of the time, you know where you stand morally on a game. For the most part you tend to be the good guy, saving the princess, killing the villains and somehow rescuing the world. Occasionally you end up as the bad guy, but the game tends to make that clear through either just simply telling you, showing you committing heinous actions or implementing a clunky moral system think Fable, Mass Effect, those sorts of games. Yet what made Shadow of the Colossus stand out was that you didnt really know if what you were doing was right. You knew you had a regular hero-quest to fulfil in resurrecting the woman you loved, but what you had to was so ambiguous and unsettling that it was like Team Ico were subtly calling you out throughout the game. As you all know by now, you had to go around killing colossi, giant creatures seemingly powered by magic and wandering through desolate landscapes. They seemed pretty harmless and most would only attack you if you provoked them, but still, you knew what you had to do and killing these creatures was it. But the game was unnerving and made out that this was slightly wrong the hero, Wander, had his appearance get subtly corrupted as you played through the game, and the voice telling you to carry out these murders wasnt exactly the most benevolent of sorts. This all culminated in an ending that served as a giant f**k you to everything else than had gone on so far as all your worst fears came true. It turns out you were slowly resurrecting some version of Satan, and he went and straight-up possessed you come storys end before you were murderised by an incoming band of people sent in to stop you, showing that everything you had done up to this point was actually some sort of manipulation. Its a very rare game that makes you feel bad for playing it, but Shadow of the Colossus pulled this off in spades, springing a revelation which made you feel retrospectively awful about all the wanton murder you committing in bringing down 14 innocent beasts. I'm sad just typing about it.