So I was thinking about a bunch of games earlier today, specifically a few that vastly changed my understanding or feeling towards video games as a whole. My question to ya'll is this: what 5 games have completely changed how you play, look at, think about, or feel about games? These games don't have to be your favorite (hell, you might not even like them), but they do have to have had a serious impact on your gaming mentality. EDIT: Your list also doesn't have to be 5. If you can only think of a single game that was a lamppost for you, name it!
Shadow of the Colossus - Before SotC I had just seen games as a time-waster, no thought required, no emotional investment, no real meaning to them. SotC made me look at how games made me feel without using any dialogue. I felt genuinely sad for these creatures I was killing for selfish reasons and started to hate my character for what he was doing for greed. For the first time I looked past the surface-layer of a game and actually saw what the meaning behind the game mechanics meant. Because of SotC I don't look at games for just their entertainment value anymore, I look at them for their meaning and <insert pretentious reason here>. SotC is the sole reason I started caring about "art" games.
Legend of Zelda: Ocarina of Time - This game was a huge influence on my childhood, but what it really did for me was make me really appreciate and enjoy parts of the game that aren't necessary to beat it. Spending hours upon hours getting the Biggoron Sword and finding Golden Sketullas was the first time I enjoyed what could be called tedious tasks in games. I probably have OCD now because of this shit. I will also fight to the death anyone who doesn't like OoT, you know, to prove them wrong.
Metal Gear Solid 3: Snake Eater - Story. MGS3 was my first MGS game and really the first story-driven game I really enjoyed. I can't actually recall giving a single meaningfully shit about story games until I tried out MGS3. Yeah I had played a few Final Fantasy games (including 4, 6, and 7), but I was never actually hooked by the stories. Now I never skip cutscenes or dialogue in games for fear of losing some crucial piece of story information.
Legend of Zelda - The single reason I started playing video games. I was only 4 or 5 when I first played it, but after trying it out for a little bit (and taking hours to even find the first level) I couldn't stop playing. I forgot about all the other NES games my family had and only played this one thing for what seemed like forever.
Super Metroid - Along with Legend of Zelda this game defined my early gaming years. Super Metroid introduced me to the "water-cooler" part of games, talking with my friends about how to get past certain levels or secret areas. We came into Super Metroid a few years after it came out, but when one of us got it we all got it. Those days were like our mini ARGs we had constant discussions about. Super Metroid was to me what Fez is to the Giant Bomb crew. Somehow Super Metroid got me loving the idea of teamwork even though it's a single-player game. This game directly lead all of my friends and I into doing the goddamn same thing with Pokemon Red, but multiple magnitudes more.