150cc is the second-fastest engine class available in the Mario Kart series in which every single CPU drivers and versus mode will begin drifting at every single corner, move at a much faster speed, and in Grand Prix mode, they use Rubberband AI. It's much faster and harder than the previous two engine classes. In Mario Kart 64 and Mario Kart: Super Circuit, there were chances where the tires could skid and cause the player to spin out if driving erratically, but later games removed that hazard. It used to be the hardest in earlier games, until the introduction of 150cc Mirror Mode starting from Mario Kart: Double Dash!!, as well as the new 200cc in an update for Mario Kart 8, which is the hardest mode in the series.
In this class, the Karts are able to reach a maximum speed of 100km/h or more, depending on the game.
- This engine class is reused for Mirror Mode, a mode introduced in Mario Kart 64 as an extra in which the tracks are played in reverse, and whilst they're the same speed, the difficulty is increased. (Though in Mario Kart 64, "Extra" mode is played on 100cc).
- In Mario Kart 7, if the player gets first place in any kind of 150cc cup, they unlock a character.
- In Mario Kart: Double Dash!!, all characters race in mixed teams.