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Hides the Digit and Note buttons; the number pad stays. 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 the moment your last mark is right. Turn it off to look over your solution and press Done yourself.
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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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A digit that appears twice in a row, column or box turns red. This does not compare with the solution; “Paint wrong digits red” does.
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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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Compares your digits with the solution and paints wrong ones red, even before they clash with anything. Counts as a hint: no best time and no rank for a puzzle played with it on.
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Every empty cell without notes gets the digits that its row, column and box still allow.
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A new digit disappears from the notes in its row, column and box.
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Tints the row, column and box of the selected cell.
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Highlights every cell with the same digit as the selected cell, or as the digit you picked first.
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The number pad shows how often each digit is still missing and greys out the complete ones.
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Pick a digit on the pad first, then click every cell that gets it. Handy for placing one digit all over the board.
