Games that offer a 2 players simultaneous mode can support two players onscreen at the same time. There are several Vectrex games that offer this option. With the Vectropolis 500 demo, included on the Vectopia cartridge, there is even a playable demo that allows four players to play simultaneously.
There are games where the players play against each other as well as those where the players play cooperatively against the Vectrex AI. Cooperative games usually show separate scores for each human player, so within a co-op game players can compete with each other for the highest scoring.
The Vectorzoa game Star Sling offers both, a two player versus as well as a cooperative mode.
List of Vectrex games that allow simultaneous multiplayer:
Original games "Player versus Player"
Homebrew games "Player versus Player":
- BATMAN VS SUPERMAN - LASERWARS
- Berzerk Arena (2 Vectrexes and VecLINK cable needed)
- Death Chase
- Disc Duel Demo(Vecmania)
- Frogs N Flies
- Nebula Commander
- Pitcher's Duel
- Player 2
- Skull Soccer (Deathchase bonus game)
- Solar Wars 2Player Preview
- Space Race
- Star Sling
- Sub Wars
- Vec Sports Boxing
- Vector Pong
- Vectropolis 500 demo (Vectopia, 4 players)