Warner Brothers knew the PC version of Batman: Arkham Knight was in "a horrible state," but shipped it anyway, according to two anonymous QA staff.

Speaking with Kotaku, the two quality assurance testers stated that the PC port's bugs and graphical issues "were the exact same, unchanged, almost a year ago".

“We reported literally thousands of bugs that were specific to the PC version relating to the frame rate,” said the source. “All sorts of f***ed up texture issues. The Batmobile in particular has always f***ed things up on PC.”

The port was so problematic that WBIE pulled it from sale last week, citing the need for "significant" work to improve performance and stability.

In contrast, Arkham Knight's console releases are technically excellent, though according to Kotaku's sources, even the console team was "totally unprepared for how hard it was on next-gen consoles.”

The QA team, all internal to avoid leaks, was about 100 people, say the sources, with the PC team making up only 10 percent of the staff.

Testing of the PC version took place at 720p resolution, even though most PC players use 1080p or higher.

It is unclear when Batman: Arkham Knight will go back on sale for PC.