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.
Highlight current group of islands Helps identifying an isolated group of islands. When disabled you can use the [Shift] key and hover over an island to highlight its group.
Highlight wrong numbers Marks in red an island with more bridges than required.
Use blue color for errors Helps color blind users to see the errors.
Click/tap between islands to draw bridges When disabled you need to draw bridges by clicking/tapping on the islands and dragging in the desired direction.
Ctrl key defines bridge direction priority Ctrl key prioritizes horizontal bridges.
Left click - 1 bridge, Right click - 2 bridges
Auto mark completed islands Marks in gray / strikes out the completed islands.
Gray out bridges to completed islands Marks in gray the bridges connected to the completed islands.
Highlight last change Makes your last move more visible.