Comcept today announced — on the game’s release day — that Mighty No. 9 has been delayed on Xbox 360, Mac and Linux.

“There were 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,” Comcept said. “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.”

Those who’ve backed the project and asked for an Xbox 360 code will receive an additional Steam code for their troubles.

The other problem is that Mac and Linux Steam versions of the game are also unavailable.

“The Mac/Linux Steam builds of the game are also in final testing by Deep Silver,” Comcept said. “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.”

We’ll keep you updated.

Thanks, Josh.