I am a good Sudoku player. I easily solve Expert puzzles in books and magazines and I love the game. So when I report that this version of Sudoku is very badly implemented, I just want to assure you about the quality of my review and the lack of quality of this game. The tiles are essentially multi-colored in an attempt to make them look 3-D. They also have rounded corners and edges which, when they are close to the game borders and the inner grid lines, makes them look like clumps of colors and shapes The font of the numbers themselves give them a rounded "blobby" look which them difficult to read as the board is filled in. And then, to make the visual aspect of the game just a little more challenging, the background color matches the starting game numbers. But the most important complaint of all is the lack of unique solutions. My first game in the free demo download was in the Easy mode and last four numbers were playable in several combinations, ALL of which were correct, but the computer program would only accept one of the versions and marked the others, erroneously I might add, as wrong. Not only does this annoy the regular level player, but a starting level player would easily think that they were at fault, making the game much less fun.