It would be nice if the boxes for each number were a solid color to reduce eyestrain, by using a custom model. Also, boxes that have been filled in at the start of the game should be a different color than boxes that are empty or have been filled in by the player. This could be done by simply removing the doodad and replacing it with a differently shaded doodad.
The ability to switch between pen and pencil would also be a welcome change. In some sudoku games, you can "pencil" in multiple numbers into the same square, to mark things that the square can (or cannot) be.
Right now, I feel as though this game is lacking anything different from a sudoku puzzle booklet, or some other online remakes of the game (though nothing like this to my knowledge has been created in Warcraft III). If the map was multiplayer, and you could have competitions to which person completes their board the fastest, then it would make for an interesting game. I do applaud your programming effort in making this game, though.
3/5