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 Badr for Information Technology (BadrIT):
The viruses are spreading! Harmful viruses and bacteria are cloning and threatening to take over the virtual lab!Help the good green Fungi overcome the harmful bacteria before they take over and SAVE THE LAB! Hurry!! Fungi needs your help!--Ataxx Bio-Warfare is a turn-based game of strategy, where you control the movement of Fungi petri dishes. Get one of your dishes within one space of your opponent's dishes and your fungi will take them over. Be the first to gain control of all the dishes on the lab table.Choose from 9 enemy bacteria, in 30 levels of increasing difficulty.Or challenge your friends in Multi-Player mode, and check the leaderboards to see who's the best Fungi of them all!