 Viral marketing strategies were used to promote the game . Visitors to the website of The Epsilon Program — a fictional religious cult within the Grand Theft Auto universe — were offered a chance to register for that group . After filling in an online membership form , the terms and conditions revealed that the site was a casting call for five people to appear in Grand Theft Auto V as members of the fictional cult . The official Grand Theft Auto V website was redesigned on 13 August 2013 to show a preview of activities and locales within the game 's world and an examination of the lead protagonists ' stories . More information was released on the website on 24 August , 6 September , and 13 September . 
