Call Of Duty: Black Ops 2, Modern Warfare 2 see massive player spikes

The Call of Duty series has seen a massive player spike following a recent matchmaking update.

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What Led to Call of Duty's Massive Multimillion Success

Call of Duty: Black Ops 2 grosses $1 billion

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Call of Duty: Black Ops 2 and the 60FPS Challenge

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Call of Duty: Modern Warfare 3 - Wikipedia

Launch Comms: Fully Equipped: A Deep Dive into Modern Warfare III Loadouts

Call of Duty: Black Ops - Xbox 360

Call of Duty: Modern Warfare III Beta: Everything You Need to Know

What multiplayer looks like in Call of Duty: Modern Warfare III --- Straight from Call of Duty: NEXT — GAMINGTREND

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Camera Spike, Call of Duty Wiki