Atari's has pushed Test Drive Unlimited 2 into next year, thanks to the game's multiplayer needing more polish.
The Eden racer was due to release at the end of next month in the US and Europe, with a multiplayer beta due before then.
As a result of the game's delay, the beta has also been delayed, with a new release expected to be confirmed by Atari in the coming weeks.
The publisher's also confirmed it will reward players who have signed up for the beta with an exclusive in-game item.
TDU2 will see gamers driving over the islands of Ibiza in Spain and Oahu in Hawaii, as confirmed by Eden at Namco's pre-E3 event in Barcelona in May.