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.
No need to do the math. Just count up. Very simple. Oh forgot to mention that, you have to count the crazy fast. In 3 seconds, for example. Just press a wrong number, you lose. Just missed some 3 seconds at the end, you lose. Let's see how long cylindrical test you.