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Buy.com has the iGadget TY-425 Sudoku Electronic Puzzle Game for just $10. With their $10 off $10 for new Google Checkout customers promotion (expires 6/30), the sudoku game is absolutely free! The iGadget TY-425 Electronic Puzzle, which usually retails for around $39.99, has three levels, a backlit LED screen and an option to examine game results to help improve your time/score. Shipping is free and there's no sales tax (except TN, MD, MA, CA).