Simply ADD and SUBTRACT the given numbers and pick the correct answer from the options. It is as simple as that!Now quickly say what's514+13+1+8+91+2+3?Don't worry! it's really easy.At first, you have 3 seconds. With first correct answer the game will begin. For every correct answer you get one point and your time increases. However you've got to be careful! If your answer is wrong the answering time decreases. So choose the correct answer in a jiffy and balance your speed and accuracy.By connecting to your Game Center, you can play on multiple devices simultaneously, save your scores and also check out your friends or other players' scores and compete with them.Your step by step progress is saved throughout the game and you can also unlock the achievements.