Maybe your game system is screwed up, or the actual game has something wrong with it.
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According to the Black Ops II multiplayer trailer, Scorestreaks will not stack, however they can keep going after you get all your Scorestreaks, similat to Call of Duty Modern Warfare 3.
A Nintendo DS game may keep freezing because the gamecard is dirty or worn out.
On playstaion you must format the hole hardrive. But be careful it gets rid of all your data
There are many reasons why a Nintendo DS game may keep freezing, but the most common issue is dust in the game card.
Before MW3 came out, when black-ops was at its peak. Approximately 4.5 million would play black ops each day. This is between consoles, so it includes the xbox count, ps3 count, wii count, as well as the PC count.. Also, keep in mind that the "current online players" isn't reliable to do this. Due to the fact that people log out and new players log in constantly.