One game? Argh, that's tough!! Especially since people can legitimately be hard core gamers, even if they're younger and couldn't have possibly played some of the older games.
So I'll break it down by age. Here are the games I think you MUST have played in order to call yourself a gamer:
If you are over 40: Zork for Commodore 64, plus all of the below
Over 30: Super Mario Bros. for NES, plus all of the below
Over 25: Civilization 1 for PC, plus all of the below
Over 20: Halo: CE, plus the below
Over 15: Call of Duty: Modern Warfare 1
English
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I also count for over 20.
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I've played the "new" SMB for the DS, Civ V, Halo: CE, and CoD 3, and I'm 15 years of age. Do I count?
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I am disappointed, there is no DOOM in this list.
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:( By that list I'm not a gamer since I've never played Civilazation 1 or any other Civilization game.
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Yes! I count for over 20! :D