Probably the easiest Halo to beat on Legendary... Halo 2 and 3/ODST are a pain in the ass
English
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I heard Reach was the easiest.
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Reach is easy too but it took me less time to beat Halo 4
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Halo 2. The Gravemind. Legendary. Yeah, uh, no. Don't even bring up LASO.
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Me and my brother beat ODST legendary in an afternoon