Kmart and Walmart are joining Toys R Us restricting the sale of mature games. Kmart has announced that the chain will refuse to sell 'M' rated mature game titles to anyone under the age of 17. The chain will use a barcode scanner to remind clerks to check ID. Walmart has announced that its stores will enact the same policy. "Kmart recognizes its responsibilities in helping parents monitor the content of video and computer games purchased for their children," said Kmart COO Andy Giancamilli. Kmart will enact the new standard on October 15 in all of its 2,164 stores.