

Valhalla provided extremely difficult for the studio to use, with developers estimating that 50 to 60% of their time was involved with trying to wrangle the engine rather than any actual game development. Starbreeze's intent was for Valhalla, a virtual reality-ready engine, to be used for all future Overkill projects, and the development of Overkill's The Walking Dead was switched to Valhalla. However, Starbreeze continued to acquire several properties over the next few years, including acquiring the under-development Valhalla game engine for around US$8.6 million in 2015. The game was initially developed on the Diesel engine, the same engine that had been used on several Grin titles. Following Payday 2, Overkill's game was planned to follow similar approaches as Payday, a four-player cooperative experience set in a persistently-changing world. In 2014, Starbreeze announced that it had acquired the rights for The Walking Dead for Overkill to make Overkill's The Walking Dead with a planned 2016 release date. Ulf Andersson went on to form the 10 Chambers Collective, which is working on GTFO, a science fiction game that borrows from some of Payday 's concepts. Bo bought out Ulf's shares of Varvtre AB, and Ulf officially announced his departure from Overkill on for unstated reasons, though remained a consultant for Overkill for the next two years. Ulf Andersson, the chief creative director on Payday 2, reportedly had been burned out by its development, and had not shown up to work for several months, according to those close to Overkill. By 2013, Bo Andersson was named CEO of Starbreeze while still overseeing Overkill's operations.įollowing the release of Payday 2, Bo and Ulf had a falling out.
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Ultimately, 505 Games sold its part of the Payday intellectual property ownership back to Starbreeze on, leaving Starbreeze and Overkill full ownership of the franchise. The net result gave Overkill the necessary funding to complete Payday 2, which was released in 2013, along with Starbreeze's Brothers, with publishing support from 505 Games. While officially, Overkill was acquired by Starbreeze on 19 April 2012, those familiar with the deal, speaking to Eurogamer stated that this was more akin to Overkill's investors, including the Andersson's Varvtre AB group, becoming the majority shareholders of Starbreeze, and the few staff and assets left with Starbreeze were incorporated into Overkill's Stockholm offices. They worked a deal with another Swedish studio, Starbreeze Studios, which at the same time was running low on cash while trying to develop Brothers: A Tale of Two Sons. Overkill desired to make a sequel to Payday, but did not have extensive financial resources to complete this project.
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Payday was a success for PC and PlayStation 3.

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The Anderssons launched Overkill Software that same year after Grin gets shut down due to bankruptcy, with their first project being Payday: The Heist, released in 2011. However, when a deal with Square Enix to make a Final Fantasy-based game fell through, Grin went bankrupt and was shut down in 2009. Brothers Bo and Ulf Andersson had founded Grin in 1997, which had some successful titles including Bionic Commando.
