From Price Books 4 Me:
Math Ninja is the most satifying math game ever! It is a game where there are two numbers randomly chosen and you have to guess whether the hidden number is higher or lower than the one displayed. Just click on the Higher or Lower button to give your best guess.
Math Ninja features Classic and Zen Mode.
Classic: In this mode the game does not end until you have a wrong guess.
Zen: In this mode you have 90 seconds to play. For every 5 correct answer the score adding starts multiplying by plus one and this also leads to increase in the range of numbers by 10, so for example when you answer first five answers the score starts multiplying by 2 and the range increases from 1-10 to 1-20 and if you answer 5 correct again then it multiplies by 3 and the range increases from 1-20 to 1-30 and so on, but be careful as one wrong guess will reset the multipliers to 1 along with the range to 1-10.
Post your scores on Game Center and compete with your Game Center friends.