Square Enix has removed the digital version of Final Fantasy 14: A Realm Reborn from sale as players struggle to log in and play.

Players of the MMORPG, which released this week, currently face long wait times. For some it's unplayable.

In a note on the game's Facebook page, Square Enix described the response to this week's release of the rebooted MMO as "overwhelmingly positive", and said this was causing the "extremely long wait times".

"As a temporary measure, we will halt sales of Final Fantasy 14: A Realm Reborn's digital download products so we can accommodate all of those wishing to play," Square Enix said.

"We are working to expand our server capacity in the coming days.

"We sincerely apologise for the inconvenience this causes."