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.
Vials of caustic chemicals drop from above; the player must flick triggers vertically to nudge the vials left or right to hit a beaker and prevent them from landing on the floor. At higher levels, pins and drain holes make things more difficult as the vials get faster and more frequent.