"Hot Wheels Open World" is an open-world driving experience released on the popular online platform, Roblox, as a collaboration between Mattel and Gamefam. The game allows players to drive a variety of cars from the iconic Hot Wheels property, racing around various courses, earning achievements, and unlocking new vehicles to use.

Some of the key features of this digital Hot Wheels experience include:

1. The ability to race with over 80 recognizable Hot Wheels cars, which can be earned, collected, and used for races.
2. An immersive open-world gameplay in one of the largest drivable tracks on Roblox, filled with stunt tracks, giant loops, and hidden collectibles.
3. An interactive gameplay experience where players can hang out with friends, show off their latest ride, compete for the best trophies, and go on quests to unlock new vehicles.
4. The ability to collect Hot Wheels cars, upgrade them, and customize the ride, offering a sense of progression and achievement.
5. A platform that caters to a variety of gameplay styles, whether you're into speed racing, achievement hunting, or just exploring the virtual world.
6. It's a free-to-play game, making it accessible for all Roblox users.

Overall, the game aims to provide a creative sandbox that brings the Hot Wheels universe to life, immersing players in a gravity-defying, adrenaline-rushing driving experience.