I'm gonna cheat and put way more than 6 games on here. Instead, I'll be discussing 6 game styles that developed my predilections as a gamer.
Baldur's Gate 2
My favorite game to date, and it gets its own category for that reason. When I first started playing it, at about age 15, it shook my world and gave me something I never had before. The best RPG story I've ever played through and the most fun I've had in an RPG then and now, just beating out Skyrim and Fallout 3 (Bethesda RPG's are their own world). Apart from its impact on me as a gamer, it impacted my imagination in ways I can't even account right now. It introduced me to table-top DnD and, as a result, a whole clique of friends, and an appreciation for high fantasy.
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Age of Empires 2, Command and Conquer: Tiberian Sun, Starcraft
My first strategy game was AoE 1, but I never really got into the genre till Starcraft rolled around. It blew me away, just like Baldur's Gate 2 did, with it's immense story and the emotional connection I formed to the characters in singleplayer. AoE2 and CnC:TS were the games that took me from an amateur RTS player to a slightly better amateur RTS player. Out of them was born a appreciation for medieval adventure, history, sci-fi, 1337 micro, the English language (these games positively taught me English, no bs), and one of my favorite books, Dune, which I would not have been exposed to if I wasn't already in love with CnC style RTS games and bought Emperor: Battle for Dune.
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Doom, Half-Life, Soldat
These formed the basis of my FPS education. Doom was probably the first game I played regularly enough to call myself a gamer, even though I was often frightened by it (I was 9 or something) and cheated to get through it. Half-Life took basic FPS principles I had learned from Doom, Duke Nukem 3D and Wolfenstein and baked a fucking cake with them. I never realized an FPS could have a compelling story and action to rival blockbuster movies until HL. That game not only made me realize that FPS is a legit genre, but it later gave me such gems as Counter Strike later. Soldat was a side-scrolling FPS and was my first experience in really competitive gaming. I was a prominent player in the small game community and frequently played (and founded) some of the most successful clans to challenge for the grand prize in the SCTFL (Soldat Capture the Flag League). If anyone here played that as an oldie (2004-2006), I was TFS, that fucking sniper. Soldat taught me that I love winning
and that with dedication and passion, you can become one of the best players in any video game.
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Commandos 2, Hitman 2
The basis of stealth gameplay as far as I'm concerned is these two games. The rush of walking without being seen, killing without being heard, taking on disguises, hell yes. Commandos 2, for its part, is one of the most challenging games I've beat, because damn that final mission. If you like puzzle games where the puzzles are "how do I kill all these Nazis without sounding out the alarm," play Commandos 2. Hitman 2 is a lot like Commandos 2, but with no Nazis, and you only have one person, but that one person has a shitload of guns. I judge stealth mechanics by the standards of these two games.
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Rome: Total War, Medieval II: Total War, Empire: Total War
I'm a huge Total War fan and this series gives me a boner every time a new game comes out. They are technically RTS games, but they're so unique that they get their own category. God is it fun to start out with some silly backwater somewhere and steadily conquer your way towards a continent-spanning empire. On top of that, the game teaches you history and geography like nobody's business. I was so in love with R:TW, in fact, that I joined the Europa Barbarorum team and spent years working with them on Punic translations/transliterations for Carthage. It stoked the flames that AoE2 had lit about history and the ancient and medieval periods, and let me kill a lot of barbarians, which is a great thing on its own. For me, there are now RTS games, and Total War games, and I prefer Total War games; that's how good these 3 games are (Shogun is good too, but I wouldn't call it formative in my case)
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Diablo 2 and Borderlands 2
These are the best loot hunt games I've ever played, short and simple. D2 was a very well-made and balanced hack'n'slash (although my favorite class, the Necro, was shafted until patch 1.10), while Borderlands 2 sports a very cool art style and a sense of humor that fails much less often that most games'.
Baldur's Gate 2
My favorite game to date, and it gets its own category for that reason. When I first started playing it, at about age 15, it shook my world and gave me something I never had before. The best RPG story I've ever played through and the most fun I've had in an RPG then and now, just beating out Skyrim and Fallout 3 (Bethesda RPG's are their own world). Apart from its impact on me as a gamer, it impacted my imagination in ways I can't even account right now. It introduced me to table-top DnD and, as a result, a whole clique of friends, and an appreciation for high fantasy.
---
Age of Empires 2, Command and Conquer: Tiberian Sun, Starcraft
My first strategy game was AoE 1, but I never really got into the genre till Starcraft rolled around. It blew me away, just like Baldur's Gate 2 did, with it's immense story and the emotional connection I formed to the characters in singleplayer. AoE2 and CnC:TS were the games that took me from an amateur RTS player to a slightly better amateur RTS player. Out of them was born a appreciation for medieval adventure, history, sci-fi, 1337 micro, the English language (these games positively taught me English, no bs), and one of my favorite books, Dune, which I would not have been exposed to if I wasn't already in love with CnC style RTS games and bought Emperor: Battle for Dune.
---
Doom, Half-Life, Soldat
These formed the basis of my FPS education. Doom was probably the first game I played regularly enough to call myself a gamer, even though I was often frightened by it (I was 9 or something) and cheated to get through it. Half-Life took basic FPS principles I had learned from Doom, Duke Nukem 3D and Wolfenstein and baked a fucking cake with them. I never realized an FPS could have a compelling story and action to rival blockbuster movies until HL. That game not only made me realize that FPS is a legit genre, but it later gave me such gems as Counter Strike later. Soldat was a side-scrolling FPS and was my first experience in really competitive gaming. I was a prominent player in the small game community and frequently played (and founded) some of the most successful clans to challenge for the grand prize in the SCTFL (Soldat Capture the Flag League). If anyone here played that as an oldie (2004-2006), I was TFS, that fucking sniper. Soldat taught me that I love winning
---
Commandos 2, Hitman 2
The basis of stealth gameplay as far as I'm concerned is these two games. The rush of walking without being seen, killing without being heard, taking on disguises, hell yes. Commandos 2, for its part, is one of the most challenging games I've beat, because damn that final mission. If you like puzzle games where the puzzles are "how do I kill all these Nazis without sounding out the alarm," play Commandos 2. Hitman 2 is a lot like Commandos 2, but with no Nazis, and you only have one person, but that one person has a shitload of guns. I judge stealth mechanics by the standards of these two games.
---
Rome: Total War, Medieval II: Total War, Empire: Total War
I'm a huge Total War fan and this series gives me a boner every time a new game comes out. They are technically RTS games, but they're so unique that they get their own category. God is it fun to start out with some silly backwater somewhere and steadily conquer your way towards a continent-spanning empire. On top of that, the game teaches you history and geography like nobody's business. I was so in love with R:TW, in fact, that I joined the Europa Barbarorum team and spent years working with them on Punic translations/transliterations for Carthage. It stoked the flames that AoE2 had lit about history and the ancient and medieval periods, and let me kill a lot of barbarians, which is a great thing on its own. For me, there are now RTS games, and Total War games, and I prefer Total War games; that's how good these 3 games are (Shogun is good too, but I wouldn't call it formative in my case)
---
Diablo 2 and Borderlands 2
These are the best loot hunt games I've ever played, short and simple. D2 was a very well-made and balanced hack'n'slash (although my favorite class, the Necro, was shafted until patch 1.10), while Borderlands 2 sports a very cool art style and a sense of humor that fails much less often that most games'.