It's a fan proof of concept, but it'll massage your nostalgia.
If you had a Nintendo 64 back in the day, you're probably familiar with the ye olde Diddy Kong Racing versus Mario Kart 64 war. It was a tough war, believe me: I lived through it. For what it's worth, I was always in the Diddy camp: not only did Diddy Kong Racing feel like a more skill-oriented kart racer, but its open world design and character roster felt more alive. It also looked better, and is probably one of Rare's greatest contributions to the console.