Mario Kart: Grand Master

Mario Kart: Grand Master is one of Mario Kart games that is released for free on the PC, iOS/Android, and Nintendo Switch.

Campaign
The main story mode, setted up in the hidden dimension, where Alchemii, a being, takes to be the greatest racer in the world. Alchemii now uses the power of Quartz Bell, the mighty combination of all six Hyper Bells. The Hyper Bells are platinum bells, so Alchemii get them all and they form the Quartz Bell. Anyone who can defeat the bosses of six worlds will challenge him, and if anyone beats him, they will be rewarded with Platinum Kart, Platinum tires and Platinum Glider.

Play as your Mii of choice and be the champion of Mario Kart. A Mii can buy uprgades for their karts, and new bodies. There are 6 leagues in the Campaign mode, with races with the game's courses, missions, and a boss battle at the end. Once a player entered one gate, they will be competiting over a race or a mission.

After clearing every level in the area, a Platinum Pipe appears, so you can warp instantly to Boss Battle.