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- Solo
- <p>
- Fill in a number in every square so that every number appears
- exactly once in each row, each column and each block marked by thick
- lines.
- <p>
- To place a number, click in a square to select it, then type the
- number on the keyboard. To erase a number, click to select a square
- and then press Backspace.
- <p>
- Right-click in a square and then type a number to add or remove the
- number as a pencil mark, indicating numbers that you think
- <em>might</em> go in that square.
- <p>
- When you master the basic game, try Jigsaw mode (irregularly shaped
- blocks), X mode (the two main diagonals of the grid must also
- contain every number once), Killer mode (instead of single-cell
- clues you are given regions of the grid each of which must add up to
- a given total, again without reusing any digits), or all of those at
- once!
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