Pretty good racing game as far as mobile games go. Not much of a challenge compared to real Mario Kart games though. You cannot run off the track most of the time, and the game is very forgiving in terms of steering, to the point that I'd say it essentially steers for you if you're doing too poorly.  It's a decent game to kill some time on and enjoy your favorite Mario characters.

Disney Speedstorm is a free-to-play kart racing game developed by Gameloft Barcelona and published by Gameloft. In the game, players can race with various Disney and Pixar characters using themed vehicles on tracks inspired by the worlds of their respective films and franchises. The game features both single-player and multiplayer modes, offering a variety of race types and challenges. Players can enjoy kart racing while utilizing character-specific abilities, and the game's free-to-play progression system allows for unlocking new characters, car parts, and skills over time. Plus the game also offers offline playable, via local play where you can setup races with friends, which is perfect for those looking for a party Kart game to play on mobile.