Eric of Vividgamer.com writes:
"Naughty Dog updated the Uncharted 3 Beta today to add the Co-Op Adventure mode. Some might remember this from Uncharted 2 as the only co-op mode. This mode brings players to locations that you might encounter in the single player campaign but changes things up a bit to add some Co-Op Elements. For those who haven't played the beta, here is a 15 minute gameplay video of the Uncharted 3 Co-Op Adventure mode on the map Syria."