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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Campaigns: [spoiler] 1. Halo 2 2. Halo CE 3. Halo 3 4. Halo 3:ODST 5. Halo:Reach 6. Halo 4 7. Halo 5[/spoiler] Multiplayer [spoiler]1. Halo 3 2. Halo 2A 3. Halo 2 4. Halo 5 (tied) 4. Halo: Reach (tied) 6. Halo 4 7. Halo CE[/spoiler]