The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Glen Prideaux:
The Numbers Game is modelled on one of the elements of the SBS game show Letters and Numbers (http://www.sbs.com.au/shows/lettersandnumbers). The player chooses the makeup of the six numbers to be drawn with between zero and four large numbers (25, 50, 75 and 100) and the remaining as small numbers (1 to 10). Once the numbers are displayed a three-digit target number is randomly generated and the player then has 30 seconds to find a way of making the target number using the large and small numbers and the four operations of add, subtract, multiply and divide. Brackets may be used if necessary. You dont have to use all six numbers. (In the App the background changes colour when the 30 seconds has elapsed, but the numbers remain visible so you can keep working if youre not concerned about the time limit.)The app doesnt check your answers ... you can do that easily enough using a calculator if necessary. It does, however, attempt to find its own solution and so show one possible way to achieve the target. This feature has been named Lili as a tribute to the shows amazingly talented Lily Serna.The App also contains a solver that allows you to manually specify the numbers and target and then ask Lili for a solution.