Although Tribes: Vengeance, SWAT 4, and Third Reich all shipped within a year of one another in 2004 and 2005, Irrational Games had been working in preproduction on the first-person shooter BioShock, the studio's most ambitious game at that point, since 2002. The game went through numerous revisions to its premise and gameplay, and was released in August 2007. In 2005, Levine, Chey, and Fermier sold Irrational Games to publisher Take-Two Interactive. Take-Two Interactive changed their name to 2K, just as BioShock was released. BioShock was a critical and commercial success, and is considered one of the best games of all time. The BioShock franchise has sold over 8 million units to date.