The open beta for Hearthstone: Heroes of Warcraft has been pushed from this month to 2014.
In an update on Battle.net, Hearthstone production director Jason Chayes said Blizzard is "very close" to launching the open beta, suggesting it may now arrive in January.
"We believe the right thing to do for the game is to not rush it out into open beta, but to instead hold onto it a little longer to make sure it's ready for wider testing," he explained.
"At BlizzCon, we mentioned that we hoped to get the game into a state where it's ready for open beta this month, but we're just not quite there yet.
"The development team has been working hard to get this out before the end of the year, but our highest priority is that Hearthstone has an awesome launch when all gates are lifted and everyone can download it and play at the same time."
As of Thursday, December 19, Blizzard had sent beta invites to everyone who opted in to the Hearthstone closed beta test prior to Monday, December 16.
Opt-ins for the closed beta will end on January 7. If you haven't opted in to the Hearthstone closed beta, you can do so here.
At BlizzCon in November, Blizzard revealed that Hearthstone is in development for iPhone and Android, in addition to PC, Mac and tablet devices.