Mighty No. 9 has seen a further delay on Xbox 360 after a last-minute issue was discovered by Microsoft, developer Comcept has confirmed.
The Xbox 360 version had been due to launch in North America alongside other platforms today, but it has now been pushed back by "several days", Comcept says. It isn't yet clear whether the bug will affect its UK release, which Xbox.com says is still on track for this Friday, June 24.
Other platforms, including the Xbox One version, do not appear to have been affected.
In a post on the game's website, Comcept explained that there had been "issues regarding the publishing process for the Xbox 360 version of the game, and a certification bug was found in the final round of testing which is delaying the release of that version for several days.
"Our team has already re-submitted the build to Deep Silver (and to Microsoft), and we expect it to go gold within a few days if all goes according to plan.
"For the backers who chose that platform we are supplying Steam keys so that those users are not left behind on release day. Once the Xbox 360 version is ready for release we will send out those codes to the relevant backers ASAP."
The Mac and Linux Steam versions "are also in final testing by Deep Silver," the developer continued. "These two versions of the game should be ready within a few days as well. We will keep our backers updated as the situation evolves."
Mighty No. 9 has already seen multiple delays, of course, having originally been scheduled to launch over a year ago in April 2015. Producer Keiji Inafune has previously said that he is "sincerely sorry... for how long we have kept all of our fans waiting".
The game is due to launch in the UK this Friday, June 24, on PS4, Xbox One, Wii U, PC, PS3 and - possibly - Xbox 360, with PS Vita and Nintendo 3DS versions due to follow at a later date.