IL-2 Sturmovik: Battle of Stalingrad is a World War II combat flight simulator developed in 2013 by the Russian software house 1C Game Studios. It inherits the name IL-2 Sturmovik from the IL-2 Sturmovik classic series (2001-2009) and is included in the general series although it runs the Rise of Flight game engine, a WWI combat flight simulator released on 2009 and developed by the 777 Studios, which associated with the 1C Company to form 1C Game Studios and develop Battle of Stalingrad. Source: Wikipedia, "IL-2 Sturmovik: Battle of Stalingrad", available under the CC-BY-SA License.