Show timer Shows the elapsed time for the current puzzle.
Pausable personal timer Pausable timer for relaxed solving. Your wall-clock time is still tracked for rankings.
Show checkpoints Save and restore board states. Useful for trying different solving paths.
Compact controls Hides the captions of the control buttons saving space on the screen.
Momentum panning Keep the board gliding after a quick flick of the finger.

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.