Multiplayer

From Styleguide

multiplayer

Describes any game that supports more than one player, either online or by sharing a single system in one location. Games can allow simultaneous (all at once) or alternating (one at a time) multiplayer support. Clarification is generally needed only when the support is alternating.

Write out the number when referring to X-player games: two-player, three-player, four-player, etc. Do not refer to a game as X-player unless it specifically requires that many players. Otherwise say the game supports up to X players.

Example: Super Smash Bros. is a multiplayer game that allows up to four people to play simultaneously. The four-player fights are especially exciting.

Wrong: Super Smash Bros. is a four-player game.

Also see: Genres, single-player.