Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9.

- 24/04/2007 - version 1.4
  - making notes on the way to solution
  - giving hints only on request
  - improvement of the "New Game" option (Easy/Medium/Hard)

- 14/01/2005 - the new version 1.3 is available here
   - some puzzles couldn't be solved

- 15/07/2005 - the new version 1.2 is available here
   - new "interactiv" mode
   - "new game" corection

- Version 1.1 - 2 / 07 /2005 :
   - algorithm bug (for some puzzles it didn't work)