Math Guardians by Jiayi Chong http://itunes.apple.com/us/app/math-guardians/id513132040?mt=8
AppsForHomeschooling.com had it right when they referred to this app an "adrenaline-pumping (...) battle-style math drill app. It was a huge hit with my kids too! The child chooses his character (the dinosaur is particularly beloved) and then battle with creatures set by the computer (different each stage), while jumping in the air to select numbers. When two numbers are selected a math equation is formed with the numbers, and the child must then pick the correct answer from 3 choices. There is also a practice mode also. With points earned for correct math answers, you earn gems and trophies for different achievements and unlock different characters etc. NO in-app purchases, yay for that! The kids think it is awesome and they are learning!
giveaway, please comment in this thread instead,