Poll Suggestion: Favorite Halo Video Game

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Halo is a first-person shooter video game. The story is about the Master Chief, a cybernetically enhanced human super-soldier and his artificial intelligence companion Cortana, who battle the Covenant, a theocratic alliance of alien races. So far, there is a main series (6) and 9 spin-off.

Which installment in 'Halo' video game is your favorite?