Touchscreen interface
This section describes the interface you'll use if you're using a machine with a touchscreen.
- To select a single square in the puzzle, just tap on that square. You may select several squares at once by swiping across them.
- Once you've selected a square or squares, use the numbered buttons below the puzzle to enter a value in that/those square(s).
- You can enter more than one number in a single square. This gives you the opportunity to enter several possibile values as you're working out the solution to the puzzle. If you enter a number that's already in the square, that number will be removed from the square.
At the bottom of the screen below the puzzle, you'll see several additonal buttons.
- Pressing the CLEAR button will clear the values from all selected squares.
- Pressing the REVEAL button will reveal the correct value for all selected squares.
- The HINT button reveals the correct value in a randomly-selected square.
- The CLEAR ENTIRE BOARD button does just that, enabling you to clear the board and start over. To avoid accidents, you need to double-click on this button to clear the board.
- Two radio buttons allow you to choose how to display multiple values in a single square, either in the order they were entered, or in increasing order.