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 a1aPPS, inc.:
a1APPS secretNumber has 3 skill levels: guess 3 numbers (easy), guess 4 numbers (experienced), guess 5 numbers (expert).Click the skill level that you want to play and numbers from 1-6 are randomly selected. You will have just 10 tries to guess the secretNumber!