how to keep laptop cool while gaming?

Another option is a cooling rack from baking cookies.

Personally, I have a Coolermaster unit with a huge fan, it dropped my temps about 10° on my HP laptop compared to it being directly on my lap. I don't do any heavy gaming on it though, it's not built for that.

Turn on the air conditioner during summer.

Anther good and cheap thing that you can do is throw an ice pack under neath. only temporary but it works. Ive bought a cooling pad for mine.

Depending on your handyman skills, I'd recommend jury-rigging a "cooling" desk.

I made one out of a cheap cookie rack with a box underneath. The top of the box is cut off (so the rack has a cavity beneath it). The "Back" of the box has 3 120 mm fans linked up to a transformer. Keeps the laptop pretty cool. Though I would strongly suggest putting a grille for the fans (the first version had me popping my fingers into the fans).