Specific games, not series.
And it can't be a game you played like a week, month or even a year ago, has to be like games that you find timeless and have/would have played several times throughout several parts of your life.
For me it would be.
Front Mission 3
Final Fantasy 9
Diablo 2
World of Warcraft (Since vanilla)
Unreal Tournament 2004
Hitman Blood Money
Hitman 2 Silent Assassin
Fallout Tactics
Fallout 2
Icewind Dale 2
Battlefield 2
Star Wars Battlefront 2
Civilizations 3
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Edited by xGarth the Goat: 1/21/2015 4:29:21 PM1. Kingdom Hearts (all of them) 2. Gears of War 2 3. Halo 3 4. MW2 (not for gameplay but just because how much fun I had with my friends on that game) 5. Black Ops 2 (zombies!!) 6. Destiny could break it's way in though.