Sorry I didn't include Halo Wars, ran out out of options. Just tell me in comments if that was your favorite, and why the game you chose was your favorite.
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Halo 3 Halo 2 / Halo 2 Anniversary Halo 5 Halo 3: ODST Halo Reach Halo 4 Halo Wars Halo: Combat Evolved / HCE Anniversary Looking forward to more Halo in the future. (: