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.
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.
Show checkpoints Save and restore board states. Useful for trying different solving paths.
Show board coordinates Helps for better reference when discussing a move or asking for help.

Show Pointer Shows a pointer helper. Useful for bigger puzzles on touch screens.
Left handed Switches the pointer direction.
Auto cross the sides of completed numbers Places x in the neighbor cells of completed numbers.
Gray out completed numbers Marks in gray completed clues.
Highlight wrong numbers Marks in red numbers with wrong amount of lights.
Blue light Iluminates the cells with blue light for better contrast.
Highlight last change Makes your last move more visible.