In terms of cultural impact alone, it has to be the Halo series. 20 years ago now they revolutionized the fps genre. Their controller layout became the standard across all consoles. Their 2 weapon max carry limit, actual plot, wide open spaces, and community support were huge steps forward for the genre as well. Halo 2 was one of the first games to take advantage of Xbox live, and it really pioneered the console matchmaking scene. Not to mention that halo 2 was the best-selling entertainment OF ALL TIME. IT MADE MORE MONEY THAN TITANIC JAMES CAMERON WAS IN SHAMBLES.
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