Q: Well I have a question. Why my New iPad is so hot within 30 minutes.i used internet from wifi and playing game 3d or 2d . It

It's normal for the iPad or any similar device to get warm when it's under heavy load. If it gets too warm, it will shut itself off and show a disabled message.

Take a look at this Apple doc -> Phone, iPad, and iPod touch (4th generation): Keeping device within acceptable operating temperatures

If you believe it's hotter than normal, make a reservation with a Genius.

Anytime! I would keep using the iPad.

After using it for awhile, you'll get a feel for the tempature changes based on CPU load. For example, it will get warmer when playing video or a 3d game for a long period of time than it will for surfing the web.