I have made sudoku solver and generator in flash. You can check it out from the following link:
http://i181.photobucket.com/albums/x269/hippogo149/Permanent/Hip_Sudoku_1.swf
Features:
1. Unique solution for each puzzle
2. Symmetrical puzzles
3. Save/Load
4. Show all possibilities
5. Pencil marks
6. Undo and show hints
