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Nice game, but needs to be improved. It need sounds and a background music (and an option to turn them off, of course), but the main thing you need to implement are highscores. That would make the game much more addictive.
Oh, and there's a bug that you need to fix: If one clicks outside the board, close to the margin, and then clicks on the board, a square with all numbers flashing appear and when it reaches the destination you always get points. Maybe you need to limit the clickarea, because it's possible to get a virtually infinite score with this bug (and sometimes I did it by accident).