- It uses cross platform libraries
- You can play games in Linux without porting (just run .exe file under mono)
- Play the same game in Windows, Linux an Mac OSX. (Someday even mobile gadgets like Nokia Maemo)
- Learning how game framework works (MonoXNA is open-source framework, Microsoft XNA is not open-source)
- Develop games in Windows, Linux and Mac OSX, using MonoDevelop or VisualStudio
- Be alternative! =)