Aces Game Studio (stylized ACES) was an American video game developer based in Redmond, Washington, acting as the developer of the Microsoft Flight Simulator and Microsoft Combat Flight Simulator series for Microsoft. As part of a move that cut 5,000 jobs at Microsoft, Aces Game Studio was closed on January 22, 2009. In October 2009, Rick Selby and Kathie Flood, alongside other former members of Aces Game Studio, launched a new studio, called Cascade Game Foundry, for the development of simulation games.