The Hulkbuster Iron Man skin exclusive to the Xbox 360 and PlayStation 3 versions is normally available via achieving Threat Level 9 in the hub world and beating the Hulkbuster miniboss. Alternatively, it can also be unlocked if save data from the 2008 Iron Man game is detected on the memory card/hard drive. The achievements unlocked from this, "Shell Head" and "World War Hulk", reference a recurring nickname for Iron Man and a 2007 Marvel comic book miniseries respectively.