Call of Duty: Black Ops II is a first-person shooter video game. It is the second installment in Call of Duty's Black Ops series, a direct sequel to 2010's Call of Duty: Black Ops, and the ninth Call of Duty game. It was developed by Treyarch and published by Activision.

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Do I need to complete more than 2 challenges per mission?

Completing 2 challenges during a campaign mission awards an unlock. Are there any rewards for completing more than 2 challenges?
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Can I check what challenges I have completed during a mission?

I'd like to know which singleplayer campaign challenges I have completed, as well as refresh my memory of what some of them are. Can I do this while on the mission?