Back to the Future Part II & III is a 1990 video game for the NES that was developed by Beam Software and published by LJN. It is loosely based off the plots of the second and third films of the Back to the Future trilogy.
In the first part of the game, Biff Tannen has not only given his past self of 1955 the Gray's Sports Almanac to change the future with, but he has taken thirty other artifacts out of their proper time periods and scattered them about through time, resulting in the space time continuum falling apart. As Marty McFly, you must travel between the three time periods (1955, 1985, and 2015) to find the artifacts and bring them back to their proper places in time, all the while watching out for Biff Tannen as well as your past selves. In the second half of the game, Marty is stuck in 1875 (instead of 1885 as in the Part III movie) and must find ten more items and bring them back to their proper places so he can keep his friend Doc Brown from altering future history.
This game provides examples of:
- Alternate Timeline: Surprisingly, 1985 seems to be the only time period that's been affected by Biff Tannen's tampering with the timeline. Not that really weird creatures appearing in all three time periods is normal stuff, though.
- Composite Character: Biff Tannen in this game combines his normal self with the appearance of his grandson Griff.
- Every 10,000 Points: Marty gets an extra life for every 100 points of junk food he collects.
- Handy Remote Control: The one you find at the drive-in in 1985 to summon the DeLorean.
- Hover Board: Marty can get this from Biff Tannen to ride around on, or he can find this just lying around, but it only lasts for a short while before it disappears.
- Never the Selves Shall Meet: Marty must be careful not to run into his past selves as he travels through time, or else he will lose a life.
- Nintendo Hard: The game has no save points whatsoever, requiring you to finish the first part of the game all in one sitting. Fortunately, there is a skip code you can enter — "FLUX CAPACITOR IS THE POWER" — so you can go straight to the second part without playing the first.
- Platform Game: It's a blatant copy of Super Mario Bros. with the bonus games modeled after Donkey Kong and Jumpman.
- Plot Coupon: The scattered artifacts of both halves of the game.
- Time Crash: A likely explanation for what happened when Biff stole thirty other artifacts from various points in time and scattered them throughout the three different time periods.
- Time Travel: An important part of the first half of the game. To have access to the DeLorean, you have to get the remote control from the drive-in theater, and then you'll have to collect enough power cells to make a jump from one time period to another.