While kart racing is something we associate with consoles there have been a few titles released on PC over the years and one such title is Sonic & All-Stars Racing Transformed. The Sumo Digital developed title sees Sonic and his pals race in vehicles capable of transforming on the fly.
You can enjoy it free this weekend on Steam and if you like it you can buy at a reduced price (£ 3.74) while the promotion lasts. Here's a handy link to launch it.