If we leave the game by pressing the back button or by exiting the app then the game's undo history is lost. I sometimes run into this problem when I accidentally press the back button in the middle of a long "trial and error" deduction. When that happens I can't undo those moves anymore and basically have to reset the puzzle and start again from scratch.
If we leave the game by pressing the back button or by exiting the app then the game's undo history is lost. I sometimes run into this problem when I accidentally press the back button in the middle of a long "trial and error" deduction. When that happens I can't undo those moves anymore and basically have to reset the puzzle and start again from scratch.