Allows playing multiplayer games with players on different platforms, allowing players to join together regardless of the platform they own.
Name variations: Cross-play
The first video game about Multiplayer: Cross-platform was released on December 1995.
Social: Teams, Co-operative, Campaign
Other: Bots, Cross-platform, Cross add-on
For each game, at least two platform instances should be tagged with this, otherwise it's invalid (you can't have crossplatform multiplayer with only single platform).
To clarify: this means that, for example, a person on a Mac can play the game with another person on an Xbox.
This does not include the server being available on other platforms than its being played on.