Sudoku Free

I like it when you can check every so often to make sure puzzle is solvable so no time is wasted if it is not. I don't think there is anything I dislike. I rate it an A or 100

best of all Sudoku puzzles available for download.

I like the "undo" and pencil features; it seems to me that most puzzles do require a "guess" at the end to be solved (no rationale for the choice)

amazing

Love it!

Lots of puzzles at each level. I like the option that automatically shows all possible candidates for each location. However one of the ads that pops up flashes very bright white lights at several times a second. Not only is that annoying but science has proved that can trigger epileptic seizures and cause brain changes in healthy brains. BEWARE!

and I can't find a setting to change it back. It went crazy so I uninstalled it then reinstalled it and the same thing happened. Five Stars before because I love it...Now not so much.

This app remains a critical part of my Surface environment, as it provides enjoyable mental exercise, through a well thought out interface.