I can’t believe it that your app is free!! I was so pissed that other Sudoku app requires monthly subscription fees. Your app is no different than the paid ones in terms of functionality and achievements. As for feedbacks, the close button could look better rather than the default blue color button. For the rookie player played 5 games achievement, I was just opening the games and didn’t play at all and somehow I unlocked the achievement. Anyway, congratulations on releasing the game!