Leaked screen of GTAIV

[A Black Falcon]

It's like saying Super Mario World isn't a part of the Super Mario Bros. series. It should by rights be Super Mario Bros. 4 because it's clearly more an evolution than a revolution in the series. SMW2 on the other hand was a pretty big deviation from the standard formula yet it is still billed as a sequel to Super Mario World.

Oh, I know, game numbering systems often make little logical sense... Mario is one example (not just Mario World 1/2, but also 'Mario Land 3' - which created the Wario Land series and barely had Mario in it at all), the Dark Forces/Jedi Knight series is another (Dark Forces, Jedi Knight: Dark Forces 2, Jedi Knight: Mysteries of the Sith (JK1 expansion), Jedi Knight 2: Jedi Outcast, and Jedi Knight: Jedi Academy...)... still won't stop me from saying that doing things like that is kind of strange, though. :)