Mistakes do not end the puzzle
A wrong digit can remain on the grid while you keep working. Sudoku Pilot has no lives or mistake limit.
Enable Show mistakes as I play to mark a digit as soon as it disagrees with the solution.
The coach checks for contradictions
When you open a hint, the coach checks for repeated digits and cells with no legal candidate. It will ask you to fix those problems before suggesting a move.
This check happens when you ask for coaching. Regular entry remains quiet when live warnings are off.
Hide the timer too
Show timer controls whether elapsed time appears on the board. Hiding it does not change the puzzle or your saved progress.