Had a perfect 3-star file until the booster courses came out, and now I'm living in 200cc hell. Base game is excellent and feels like the pinnacle of what a "Mario Kart" is about, but the booster courses are just a lot of more stuff. The worst additions are the Mario Kart Tour tracks, which are difficult to follow on the fly. 200cc is so fast it often feels more like a joke than an actual difficulty increase. CPUs often bump into walls and fall off the course due to uncontrollable momentum, it leads me to believe that it's to be expected.

Otherwise, this is a very good racing game for people who do not like racing games.