Laptop gets really hot when playing games?

-My laptop gets really hot when I play games (like starcraft 2) more than 30 mins and that causes the game to drop frame-rate and lag. I had this ASUS laptop for 2 years now and it's actually a really nice gaming laptop. It has Intel Core 2 duo 2.40 GHZ (2CPUs), 4gb of ram, Geforce GT 130M 2gb video memory. So basically I can run any game right now. I have a laptop fan under it and it helps a little. It never used to get this hot. I was thinking about opening up the laptop and getting the dusk out. Is that a good idea? If not, what should I do? Is this a common problem for gaming laptops? Should I just forget it and buy a desktop? Is there anything I can do to fix it?ya its usually common that laptop gets heated when playing games...its nothing to worry its common,,, better if u have a cooling pad use it
don't worrry, you're laptop is ok, i had a studio 1735 with 3GB RAM and ATI Mobillity Radeon HD 3650 256MB video memory and Core 2 Duo 2.10 GHz and my HDD is almost out of space and i play the sims 3, it runs smoothly with just a little lag and if i play for long, it will still be the same i just hear more sound from the from the laptop. no fans. you can try to lower the graphic setting in the option or bring iit to the shop and clean it...if you use it for somthing big like playing games your laptop will get hot, very hot