They got it right.
I was so impressed by Sudoku Daily that Im buying the full version. The skins are beautiful, but what impressed me was the ease of reading and manipulating the pencil marks, how number entry does not block out important squares (it comes up without overlapping the row/column in question and can be moved or made transparent), being able to turn error indicators on and off, how number entry remembers whether its in pencil or number mode, etc. --- fully thought out for ease of use, as befits a product for an Apple platform.
hamlink about
Sudoku Classic