Touch Zombies In Circle - destroy many zombie as many as possible by touching zombies in circle

Category	Price	Seller	Device
Games	Free	Sang Ki Kwon	iPhone, iPad, iPod

Here and there zombies come.
Zombies are in circle.
The point is that touch zombies in fast speed before this circle goes smaller.
You can keep circle size by touh the place where many zombies reside together.
If circle goes smaller and disappears then game will be over.
Must touch zombies in circle before circle goes smaller and disappears.
Win a victory by destroying zombies.
Compare your score with other's in global leaderboard.