• Show timer Shows the elapsed time for the current puzzle.
• Compact controls Hides the captions of the control buttons saving space on the screen.
• Highlight duplicate tiles Marks duplicated tiles in red.
• Use blue color for errors Helps color blind users to see the errors.
• Magnify the current tile while drawing Shows a helper for easier domino placement on touch screens.
• Left handed Changes the position of the magnifying window.
• Highlight last change Makes your last move more visible.