Back to the Future Part II & III is a 1990 video game for the Nintendo Entertainment System based on the second and third films in the Back to the Future trilogy. The game was produced by Beam Software and published by Acclaim Entertainment under their LJN label. Plot Part II When Doc takes Marty to the year 2015 to prevent his future son from committing a crime, old Biff takes the Gray's Sports Almanac and travels back to 1955 and gives the book to his younger self. Over the next three decades, young Biff uses the information to win money on the outcome of each sporting event he bets on, making him the richest and most powerful man in the world by 1985. To ensure that no one else gets their hands on the almanac, Biff travels through time and collects various items and puts them behind locked doors in three different periods. This action has caused a disruption in time, and now the space-time continuum is falling apart. With Hill Valley in ruins, Marty must now travel to all three periods, then find and return all the items back to their original places in order to retrieve the almanac and destroy it. Part III After Marty returns all items to their rightful places and burns the almanac, Marty then receives a letter from Doc via a courier that was written in 1875 (although 1885 in the film). According to the old letter, Doc has become stranded in the past and must be rescued or else this will start to threaten the future. Now, Marty must go back in time in order to rescue Doc with the aged but repaired DeLorean. Before they can return to 1985, Marty must find and return ten more items to their rightful location. Gameplay Street level The player controls Marty and attempts to defeat enemies by jumping on or throwing projectiles at them. The player must also collect fuel for the time machine and junk food for extra lives as they progress through each timeline. Scattered and hidden throughout each timeline are Object Rooms (containing objects which must later be returned to other locations) and alleyways used to navigate street to street within the timeline. Some alleyways appear in all three timelines while others appear in one or two but not all three. At other points the player must use the DeLorean to