Requires a fix. Mixing Clear Line and Undo when u mix working from the top and from the bottom, can lead to inputted lines being un-erasable. Game needs a ReStart Puzzle button. I dont want to fix this by erasing my save file, either. This bug is preventing me from clearing the last puzzle achievement. EDIT: Turns out if u fill in all lines, then go to the last line and re-do that step, the puzzle will register as solved, even when the 2 lines in the middle differ by more than one letter. Definitely needs fixing.
