Play as either Mario or Luigi and kill enemies with your Kart. Use the Cursor Up and Down keys (Arrow keys) to move your Kart. Speed up by using the Right Arrow key, and stop by using the Left Arrow key. Press the "A" key to use the Nitro Boost for some super speed.
link game: http://www.gamessupermario.net/game/Super_Mario_Kart_Xtreme.html
Super Mario Kart Xtreme: http://gamessupermario.wordpress.com/2013/08/15/super-mario-kart-xtreme