I am an avid user of your Sudoku Portable. I understand you want to keep the application small so you have more than one solution to your puzzles. That is OK I just use this as brain candy. I would like to see an update that will automatically delete the small numbers in a square when a large number is selected. And I just mean the small numbers that correspond to the quadrant the number is in as well as the associated horizontal and vertical lines with that number. It would make solving the puzzle much easier and faster.