Got hooked on this during a long wait yesterday. While playing, the partitions between the nine cell areas suddenly became thick grey lines. Did I touch something that caused this? Or?
Also there is weird screen artifact that develops during this game. There is a an irregular vertical line that looks like a scratch that develops down the middle of the screen. Quit/Save the game and then re load it clears it up. But it eventually comes back.
at first i thought it was a dirty mark
Maybe I'm the only Kobo Aura sudoku nut