Directions

• The "big numbers" (black) show the values for each filled cell
• The "small numbers" (gray) show the candidates for each empty cell
• The arrow keys (Up, Down, Left, Right) move the yellow cursor to select a cell
• The number keys (1-9) set the value of the selected cell
• The Delete key clears the value of a filled cell
• The C key toggles the display of candidates
• Invalid moves are not allowed; conflicts are indicated by a red flash in the conflicting cell
• Sudoku description and rules can be found in Wikipedia and Sudopedia

Notes

• If keys stop working, click on the Sudoku board to restore keyboard focus to the application
• The B key changes to a blank board suitable for copying a new puzzle from a book/web site/etc.
• The W key changes to a sample board from Wikipedia (easy)
• The S key changes to a sample board from Sudopedia (hard)
• The F key changes to a nearly complete board (very easy!)
• When copying a board, hold down the Shift key when typing the numbers to bold the given values
• When guessing a value, hold down the Ctrl key when typing the number to italicize it
• A number's display type (normal<->bold<->italicized) can be changed in-place; change the number's value by deleting the old value before typing the new one
• For more information, see the blog post about Silverlight Sudoku Helper on Delay's Blog