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to me. halo 2 is the hardest. You can't respawn over in co-op mode
I have to agree, Halo 2 is hardest, though not most challenging.
Pink Floyd - Live at Pompeii
Campaign wise, most definitely, in my opinion of course.For me it would go... (From 1 being the most difficult and 3 being the least difficult.)Halo: CEHalo 3Halo 2