on a sequel. Levine and Irrational would instead join development of a game in the XCOM franchise. By contract renewal negotiations in the middle of 2008, however, Levine had reportedly lost interest in the XCOM project and wanted to return to BioShock. Levine's lack of interest was matched by disappointment within the studio's ranks that another company was making the next BioShock, not Irrational. While 2K Marin continued working on BioShock 2 and Irrational's Australia office (later 2K Australia) continued work on XCOM, the main Irrational team would draw up concepts for the next BioShock game. Concept work on Infinite began in February 2008; 2K granted Irrational a great degree of creative and financial freedom to develop the next game; Irrational considered several settings for the game, including reusing Rapture or setting the story in the Renaissance period, before deciding on the floating city of Columbia. While the setting of a floating city would remain consistent, the time period, characters, and the story itself remained undefined as the team churned through different ideas. Designers and artists would sometimes spend months developing ideas that would be scuttled within minutes after priorities shifted or Levine changed his mind. Levine's creative process was described as brilliant but time-consuming, as he focused on very small details; one department within Irrational ran dress rehearsals for any meetings with Levine. At the same time as the story mode was undergoing constant revisions, a set of multiplayer modes was also being designed. The first mode, Border Control, was a tower defense game intended to be set within the game's world. The other multiplayer offering, code-named Spec-Ops, would have been a cooperative mode with up to four players. Matches would take place on maps that would evolve after release, using environmental storytelling to depict Columbia's evolving civil war. Irrational began hiring and expanding its team. One notable missing person from the original BioShock team was Jon Chey, who had worked with Levine since their days at Looking Glass Studios in the 1990s, and who headed the Australian branch of Irrational. The two developers' differing aptitudes meant that the two teams had what Chey called a "synergy", with Chey's team emphasizing technical ability while Levine's team was more creative-minded. Dissatisfied with the questions of what Irrational's next project would be and dissatisfied with the dynamics of a large company, Chey left 2K in 2009. Chey's departure meant Levine had