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 Olivier Bernal:
Play Sudoku for hours thanks to an unlimited number of grids! 3 difficulty levels, a simple an intuitive design ! Face the Sudoku challenge in the metro, at the office, in a waiting room, in the toilet! 3 difficulty levels: Easy, Normal, Hard! Youll finish an Easy grid in 10 min, whereas you could spend all night on an Hard grid. Sudoku for all levels! Features: Put down all candidates for a cell (example: the cell can contain 1,4,6,9) Click a number to show all of the numbers of the grid (example: clicking on 1 shows all the other 1s) You can view clearly which line and which column you clicked on! Access a users manualAccess to help that will: o Check the grid to see if you made a mistake o Add a number if you get stuckBe careful as using the help feature adds a time penalty to the clock.See all the possible candidates for the empty cells in 2 seconds? Thats easy: use credit to calculate it automatically. You can purchase additional credit directly within the application: you receive 2 free credits upon first installation. Theres nothing unnecessary in this application, just the essential.