The answer will be different for girls and boys. For most people, a good game is just putting out any video game. Usually both genders will comply to that.
You can play many games. Ask your child, if its a surprise party ask some friends what tjey think is a good game to .
I still love pinatas, and I'm 10.
Piggle wiggle, ture or bare, red rover, tellaphone, and A-Z game
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You could have a chill out party where you just eat ad play twister and fb games like that! Your friends will love it!
(check related links)
Some party games for a 12 year old could be skittle races with straws, or twister. You could also make a scavenger hunt for things in the neighborhood.
hide the sausage
definitely truth or dare and spin the bottle.
Pin the tail that way know one will get hurt
On the new Nintendo 3DS, there have been several great games to have come out. There has be the Mario 3D game. There has also been some great third party games as well.
Tofu flan.