Why does the MacBook Pro make a loud heat noise?

So, when I was playing a game called "Modern Combat Domination" my MacBook Pro make a very loud heat noise? Does that mean I should stop playing the game? I worried. Thank You.

That means your fan(s) sped up to dispose of the excess heat generated by playing the game. It's a sign that your machine is taking care of itself properly.

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    Ah right at the top.
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