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