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Hides the tool buttons for a tidier screen. The tool you used last stays active. Applies to this device only.
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The bar with the clock, zoom and settings stays at the top while you scroll, handy on big boards.
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The puzzle counts as solved as soon as every region is right, drawn with lines or filled in with colours. Off: you press Done yourself, and only the lines count.
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Adds buttons below the board to save up to 10 positions and go back to any of them, e.g. before a bold guess.
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Shows letters above and below the board and numbers at its sides, so you can name a cell, like C4.
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Play without a running clock. Your time is still measured and shown when you solve the puzzle.
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Removes the Hint button and its H key, so it does not tempt you.
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The clock stops while the game is in the background and gets a Pause button. Times measured this way are not ranked.
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An area closed off without a circle turns red, and so does the circle of a closed region that is not symmetric.
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Shows errors in blue instead of red, which is easier to see with red-green colour blindness.
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Outlines what your last move changed, so you quickly find your place again.
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Plays a short celebration on the board when you solve a puzzle.
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Draws faint dotted lines between all cells, which helps with counting and finding partner cells.
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Dragging draws one connected line from dot to dot, round corners too; moving back shortens it. Off: each edge you drag over is set on its own.
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Press a circle and drag onto a cell (on a touch screen, hold the circle first): the cell and its partner across the circle light up. Red means the partner would lie outside the board.
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A circle turns black once its region is finished, so you see at a glance what is done.
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Gives every finished region a colour of its own, different from its neighbours.
