Location: Birmingham, UK, dull corner of the world
I don't like it. It might look fancy, but the screen is too cluttered. I have tried quite a few, including this one and Freeverse's effort, and have come to the conclusion I like Enjoy Sudoku the best. Ironically it's got the least attractive graphics and sound out of them, but it has the functions I like the best. With Enjoy, you click a number from the bottom, and immediately of that number are highlighted in the grid so you know exactly how many are left to fill. Then tap an empty square to put that number in. When all of a number have been entered onto the grid, that number is then permanently highlighted at the bottom of the screen. This way you always know at a glance which numbers are left. You don't get that on any other Sudoku app (at least on any I have played), which makes it the most user-friendly in my book.