Why does my mac overheat and shutdown when i play games?

It used to happen when i had windows on bootcamp, i got fed up with this and stoped using it.
However yesterday i was using it to play a simple game of pool on facebook, full screen, and it turned off.
I touched the top left and it was way too hot like almost too hot to touch.
I just clicked my mouse and it came back on and i closed everything down and just let it cool off and it stayed on.
Anything i can do to help the problem?
Cheers
Jay

Make sure the vents at the bottom of the screen are clear of dust (shut it down and vacuum).
When running, bring up Activity Monitor to see if anything is driving CPU usage to excess, say consistently greater than 25% to 30% or more
Install iStat Pro to monitor what is generating heat.
Run the Apple hardware test to see if it spots any obvious hardware issues that could contribute to the problem. You'll need your original OS X disk to run it.

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