As you can tell by the image, my favourite is ODST (much soothing, very rain) but I love the others just as much
You're not allowed to answer Halo 5 for obvious reasons.
If you don't like or haven't played halo and you're just here to hate them I suggest you don't comment
EDIT: [b]How the -blam!- did I remember Spartan strike and FORGET Halo Reach, my second favourite halo game?! Wtf is wrong with me? Comment if Reach is your favourite[/b]
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It's hard to pick 1, but Halo 3 has my favorite soundtrack (it's almost my favorite game soundtrack). ODST is almost my favorite, but nostalgia for 3 makes it better. Reach is my third favorite (second favorite game). While the music is fantastic, 3 and ODDT are more enjoyable to listen to. Halo 2, while good, doesn't feel as expressive as 3 and ODST. CE is the one that started it all, but it's not quite as good as the later games (except 4. I like CE more than 4). 4 doesn't feel like Halo to me personally. It doesn't have the Halo theme in it for one. I haven't really played the others that much, so I can't judge them.