NES Four Score
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Prior to the release of the Four Score, games featuring support for more than two players had players alternate turns using the same set of NES controllers. Other games that originally featured support for more than two players decreased the number of simultaneous players to two.
On the Four Score, there is an option to switch between two-player and four-player modes and turbo A and B buttons that give any of the connected controllers a turbo boost. The Four Score can also be used as a controller extension cable because the wire which leads from the accessory to the NES is several feet in length.
The Four Score is similar to the earlier NES Satellite, a device that allowed four players to connect to the NES with infrared wireless communication.
NES Four Score Compatible Games
The 4-Players Adaptor (4人プレイヤーズアダプタ) was a licensed peripheral released for the Famicom in Japan by Hori. It is the Famicom's equivalent to the NES Four Score. Its purpose was to allow up to four players to play simultaneously in compatible games by allowing for additional controllers to be connected through the console's expansion port. The adapter also features a switch that allows the first two players to use external controllers as well in lieu of the standard Famicom controllers, giving each player the choice to use an external controller. Many of the titles in Technōs Japan's Kunio-kun series supported the adapter.
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- Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dai Rantō
- Nekketsu Kakutō Densetsu
- Nekketsu Kōkō Dodge Ball Bu 
- Nekketsu Street Basket: Ganbare Dunk Heroes
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- U.S. Championship V'Ball
- Up to 3-players simultaneous
- Based on, or port of, a game with 3 or more players
- Up to 4 players take turns
- Only 2 players at a time are simultaneously active
- A single player uses up to 2 controllers
- Four player mode only available in Bean Ball Mode