Rockstar's ambitious Grand Theft Auto Online launches tomorrow for those that have Grand Theft Auto V . How will you access it? First you'll need to download a Title Update that will be released on the PlayStation Network and Xbox Live tomorrow around 7AM Eastern time if things run smoothly. Once the update is installed, you'll boot up the game as you normally would and then pull up the character select wheel to select the newly unlocked fourth character slot. This will take you straight into GTA Online.
There's a big narrative in GTA Online with an initially offering of 700 missions on top of racing, deathmatches and the like. As far as the narrative is concerned though, it takes place a few months prior to the events in GTA V.
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via destructoid http://www.destructoid.com/what-you-need-to-know-to-start-playing-gta-online-262689.phtml