The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From MD Wilson:
Train you brain with Maths Mastery--How to play---Choose correct answer in 1 second.-Reach high score-Beat your friends**Features**- 4 Mode: easy, medium,hard and expert.- 3 operations: plus, minus, multiply. - Maximum number up to 50;- Good math exercise for kid by setting time with practice mode.EASY to play, HARD to master! what about you?