Mary Kate and Ashley: Winner's Circle is a horse racing game. You can pick either one of the Olsen twins or make your own customized character, and customizable horse(s), then an event. Most events are essentially clock or checkpoint race where you must make it through the track or jump all the gates before time runs out, but there are also challenge stages with more varied goals such as collecting horse shoes. You may also groom your horse as well as buy outfits in the mill shop to further customize your character!