If you want a tougher challenge check out
http://itunes.apple.com/us/app/sat-competition/id550144876?ls=1&mt=8
Important- make sure to press the refresh button after you bought this because more info has been added...Thanks!
SAT Game allows you to compete against millions of the smartest people around the world using Gamecenter. This app not only lets you practice thousands of SAT words but also see where you rank among the world!
There is simply no other app like it.