

Coming back after a week to share what I thought of it:
-
I loved the app itself and all the different ways to input values
-
the different game modes are quite creative
-
all the extra restrictions added by the different game modes make the puzzles a bit too easy for my taste
-
miracle mode is fun until you get a few numbers in, but then it becomes quite straight forward again.
-
all of the puzzles (at least as far as I played) follow the same pattern and when you notice it you can skip the whole sudoku part and answer it just by pattern recognition.
There are many different ways to define “stable”. Linux is better in some, windows might be better in others.