How to Undo a Turn in a Sudoku Game

"Good turns out amazing you will because i haven't had that exact experience," he says. "You have a pilot that allows you to undo's per round which the second i got that pilot i was like yep you're coming with me." The game has complexity of actions and sequencing so that it's hard to see the solution is a steven sausage roll or sudoku-style games, but in this one there are unlimited undo's right?" He continues: "I've come to the situation to treat it much more like oh here's a line in chest that i could be doing".