Boy, is this game clunky! I play iPod Sudoku and Nintendo Sudoku (which is the gold standard!). In this version, aside from being the ugliest color ever (70's avocado green, yecch!), it is just too difficult to get your choices accepted, ie, make tiny note #, rather than the final answer #. Don't waste any time with this. If the free version is this BAD and ugly, there's no hope for the paid version!