HP G60 gets hot in corner?

I had this same problem on my old computer. It is probably your graphics card heating up. I used an external fan and it really helped, but you need to prop up the computer so the air can flow underneath it. There should be vent holes under there and if you prop it up, the heat will come out of the vents and the fan will blow it away. You don't need anything fancy to prop it up, just something to keep it up off of the table or desk. I used a small rectangular box that I had. I also play Sims 3, so I know what you are talking about.