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saints row the 3rd
Complete all camoflages then you have it. It will be on the same place to choose your camoflages.
All you have to do is complete more achieve more achievements and Co-Ops
The Call of Duty Wikia has a complete list of the Call of Duty Black Ops weapons from the related link
every Thursday
you need to complete the game first then go on to spec ops and there it is dead ops.
You must complete all 55 levels before hand.
just hack it
complete the campaign
All you have to do is complete 5 of the challenges on the final mission
By beating the campaign.
It depends on how good you are and how you play those games