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.
Pic Tile lets you choose a photo and chop it into tiles and scramble it, then you need to slid the tiles one by one to make the original photo again. It is the 2D version of the magic cube but played with photos.