DALLAS (AP) — An unopened copy of Nintendo’s Super Mario 64 has sold at auction for $1.56 million. Heritage Auctions in Dallas said that the 1996 video game sold Sunday, breaking its previous record price for the sale of a single video game. A spokesman did not immediately respond to an inquiry about who purchased the game. The sale follows an unopened copy of Nintendo’s The Legend of Zelda selling at auction Friday for $870,000. Heritage’s video game specialist Valarie McLeckie says they were shocked to see the Mario game sell for more than a $1 million two days after the Zelda game broke its past record.