Amazing. It's the most fun I had in a mobile game. This is a mobile port of the popular game "Kart Rider", which has an established competitive esports scene in Korea. A lot of polish went into the visual, gameplay and controls, which seems rare for a mobile game. Expensive microtransactions are necessary for the best karts, but you can still win races with practice kart up until the genius rank (second highest tier in rank). Also, they have so far been generous with bonuses. Highly recommended.