One of the biggest talking points of the Modern Warfare 3 demo was the introduction of . Unlike the traditional "corridor" levels Call of Duty is known for, OCMs give players a wider sandbox to play in.

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The Call of Duty: Modern Warfare 3 Singleplayer Demo: A Glimpse into the Chaos

The demo understood that in a "top" demo, context is king. You didn’t need to know the controls; you needed to feel the desperation.