The upper set of colored cells is for the sudoku puzzle itself; the lower set of cells shows what values are still available for use in the corresponding upper cell. You may change the values in any of these upper or lower cells as you figure out the puzzle.
You may use the large box on the right to easily import or export a puzzle. For the import and export functions, a zero is used for empty cells. You may use a comma (,) or period (.) as a separator, or skip using separators completely.
The "Symbols" box holds the set of valid values. You may change these to letters so that you can use this page to solve Wordoku puzzles.
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