An anonymous reader writes: Unreal Engine is the famous game engine that was used to implement such games as Unreal Tournament, BioShock Infinite, Mass Effect and many more. On March 19, 2014 Unreal Engine 4 was made publicly available from a GitHub repository. It was a big event for the game development industry. One of the companies that took an interest in this was PVS-Studio, who created a static C/C++ code analyzer. They analyzed the Unreal Engine source code and reported to Epic Games's development team about the problems they found. Epic suggested a partnership with PVS-Studio to fix those bugs, and their challenge was accepted. Now, PVS-Studio shares their experience in fixing code issues and merging corrected code with new updates in a major project that shares its source code.