It's been 20 years since the first installment of the Halo series, but it's undeniable that Bungie's work on Halo: Combat Evolved and Halo 2 dramatically changed the video game industry in many ways. The first game was what started it all, but Halo 2 was arguably more revolutionary than Halo: Combat Evolved ever could be, due to Bungie being even more ambitious with the sequel.
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