Mathdoku

Not looking good guys.

When you start this Mathdoku app, The Back-Key of your Samsung phone becomes inoperative.. (when you turn Mathdoku off, the back-key works again). you need the back-key in order to make calculations, like finding the factors of a large number.. But what is most annoying is the fact that the Mathdoku program does not give you any service (like revealing the value of a cell if you feel you cannot proceed otherwise) or any feedback about what you are doing: You can fill the grid with fully nonsensical values without any reaction from the app. It does not indicate how long you have worked.. it does not erase the temporary pencil marks when they are replaced with final values..