An established multiplayer modification for a couple of games from the Grand Theft Auto series, with the game currently supported being Grand Theft Auto: San Andreas.
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Pro Runs well on dated hardware
Grand Theft Auto: San Andreas, being a game from the year 2004, works on pretty much anything today, including mobile phones. The modification itself adds little overhead to the whole system.
Pro No arbitrary limits on the number of player slots
As long as your hardware keeps up, you can have as many players playing simultaneously as you want.
Pro A wide range of gamemodes to choose from
These include Race, Deathmatch, Briefcase Race, and Freeroam, and are accompanied by a multitude of user-made gamemodes to be found on the modification's website.