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The Nintendo Vs. Series (for "versus") was a series of arcade video games designed for two-player competitive play using the VS. UniSystem or VS. DualSystem, arcade system boards based on the Nintendo Entertainment System. Many of these stand-up or sit-down arcade machines had two screens and controls joined at an angle. These games were arcade ports of home video games for the Nintendo Entertainment System, thus they could be sold cheaply to arcades in the late 1980s.

The Vs. Series were designed primarily as a kit to retrofit Donkey Kong, Donkey Kong Jr., Popeye, and Mario Bros. machines. Being as such, they require the same special monitor that these coin-ops used. These monitors use inverse voltage levels for their video signals as compared to most arcade monitors. Commercially available converters allowed one to use any standard open frame monitor in your game.

Almost all Vs. games ran on identical hardware, with the notable exception that four special PPUs (video chips) were also made, each containing a different palette (each of which appears to arrange the colors completely randomly). Most boards could be switched to a new game simply by swapping the program ROMs, though the appropriate PPU would also have to be used - if not, the game would appear with a completely garbled palette. Several of the later Vs. games employed further measures of protection by using special PPUs which swapped pairs of I/O registers and/or returned special data from normally unimplemented regions of memory - attempts to run these games in other Vs. systems would result in the game failing to even start.

There were some dedicated Vs. double cabinets produced which looked like two games butted together at an angle. A single motherboard powered both games on those models.

The infamous dog can be shot in Vs. Duck Hunt.

Sometimes the games were different from their NES versions. For example, Vs. Super Mario Bros. is considerably more difficult than Super Mario Bros, and includes some levels from Super Mario Bros.: The Lost Levels. The graphics were also different from their NES counterparts; for example, Vs. Duck Hunt had more details and animation sequences than its console counterpart.

• Vs. 10-Yard Fight
• Vs. Baseball
• Vs. Balloon Fight
• Vs. Battle City
• Vs. Castlevania
• Vs. Clu Clu Land
• Vs. Dr. Mario
• Vs. Duck Hunt
• Vs. Excitebike
• Vs. Freedom Force
• Vs. Golf
• Vs. Gong Fight
• Vs. The Goonies
• Vs. Gradius
• Vs. Gumshoe
• Vs. Hogan's Alley
• Vs. Ice Climber
• Vs. Kung Fu
• Vs. Ladies Golf
• Vs. Mach Rider
• Vs. Mahjong
• Vs. Mighty Bomb Jack
• Vs. Ninja Jajamaru-Kun
• Vs. Pinball
• Vs. Platoon
• Vs. Punch-Out!!
• Vs. R.B.I. Baseball
• Vs. Raid on Bungeling Bay
• Vs. Slalom
• Vs. Sky Kid
• Vs. Soccer
• Vs. Star Luster
• Vs. Stroke and Match Golf
• Vs. Super Chinese
• Vs. Super Mario Bros.
• Vs. Super Sky Kid
• Vs. Super Xevious
• Vs. Tennis
• Vs. Tetris (Tengen version; not licensed by Nintendo)
• Vs. TKO Boxing
• Vs. Top Gun
• Vs. Trojan
• Vs. Urban Champion
• Vs. Volleyball
• Vs. Wild Gunman
• Vs. Wrecking Crew
• Vs. Xevious
• Vs. Donkey Kong 3

• PlayChoice-10, another arcade series from Nintendo
• Nintendo Super System, arcade system based on the Super Nintendo

• Nintendo Vs. Series at the Killer List of Videogames
• Rainemu Nintendo VS. Page
• Nintendo VS System at PAR PlayChoice-10 Games and Resources