The story of Back to the Future III follows Marty McFly and Doc Brown as they try to get back to 1885. They are on a mission to find a way to send $640,000 to 1885 so that it can be used to build a gold mine in Tombstone, Arizona, which will then allow them to go back to 1985. However, things don't go according to plan and they must face various obstacles along the way.
Gameplay-wise, Back to the Future III is an action-packed adventure that features fast-paced motorcycle chases, shootouts with outlaws, and exploration of different environments. Players control Marty as he navigates through various locations, including the Wild West, in order to collect items and complete objectives.
The gameplay is divided into two main sections: exploration and combat. Exploration involves navigating through open areas, interacting with non-playable characters, and solving puzzles to progress through the story. Combat involves shooting outlaws and avoiding danger as Marty rides his motorcycle through the streets of Tombstone.