Not as straightforward as you might assume.
I can often cross-reference Mobygames with Wikipedia and the official title of a game will be different. Hell, sometimes the article name of the game on Mobygames is different than what the description reads.
A colon? Or or no colon?
Nickelodeon Avatar: The Last Airbender?
Avatar: The Last Airbender?
Nickelodeon - Avatar: The Last Airbender?
Burnout Revenge or Burnout: Revenge?
Is it SVC Chaos: SNK vs. Capcom
or is it really
SNK vs. Capcom: SVC Chaos?
Another example is 2005's "Area-51" which clearly has a hyphen on the box cover art but on Redump it is just "Area 51".
.. and so on and so forth. How is this decided? I've seen some subtitles/bits added on to game titles that don't even show up in th main menu/screen.