Settings
Gameplay
Auto-check mistakesMark wrong numbers as mistakes
Highlight areasHighlight the row, column and box of selected cell
Highlight identical numbersHighlight all cells with the same number
Highlight duplicatesShow conflicts in rows, columns and boxes
Auto-remove notesRemove pencil marks when a number is placed
Hide used numbersGrey out numbers placed 9 times
Show timer
Feedback
SoundsPlay sounds on number entry and completion
VibrationVibrate on mistakes and completion
Mistake limit