SEGA has told Eurogamer that the PS3 version of Sonic Unleashed has been pushed back to an unspecific date in December.
However, all other versions - Xbox 360, Wii and PS2 - will launch as expected on 28th November.
The publisher also doused speculation that the European release of Sonic Unleashed would be sub-standard in comparison to the delayed Japanese version, which was apparently held back to improve quality.