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MonoGame is a free and open source C# framework used by game developers to make games for multiple platforms and other systems. It is also used to make Windows and Windows Phone games run on other systems. It supports iOS, iPadOS, Android, macOS, Linux, PlayStation 4, PlayStation 5, PlayStation Vita, Xbox One, Xbox Series X/S and Nintendo Switch. It implements the Microsoft XNA 4 application programming interface (API). It has been used in several notable games, including Bastion, Celeste, Barotrauma, Fez, and Stardew Valley.