From Siliconera:
"Even though most of the world has moved on from Super Mario Kart to Mario Kart DS or Mario Kart Double Dash, OK Impala has a new enhancement for the classic kart racing game. The Super Mario Kart – Impala Battles patch adds in four new battle mode stages to play on. "
http://www.siliconera.com/index.php/200 ... ario-kart/