Back To The Future Parts 2 and 3 is an action game for the NES, and is a single player experience. It was published by LJN.
Back To The Future Parts 2 and 3 is a commonly available game for the NES. It shouldn't be too difficult to find this game for purchase. In good condition, the game is worth about $2.00. Back To The Future Parts 2 and 3 was released in September 1990.
At the title screen, hold B + Select then enter the password FLUXCAPACITORISTHEPOWER.