BioShock $3 million,GTA IV $15 Million

BioShock franchise is off to a good start, since the takeoff of BioShock 2. Today it was announced that BioShock 2 has surpassed $3 million in sales since its release on the Xbox 360, PC and PlayStation 3. With BioShock 2 quickly catching up to the original game's 4 million lifetime to date sales, there could be a possible BioShock 3.

Take-Two has some bragging rights because the Grand Theft Auto series has announced that it has reached $15 million units sold worldwide.

Source: Kotaku