I used to work on a game where one of the mechanics was that you could write your own C# scripts. In a text box. We compiled the code in the game engine with Ro

I used to work on a game where one of the mechanics was that you could write your own C# scripts. In a text box. We compiled the code in the game engine with Roslyn. You don't need an IDE for C# any more than you do for any other language. You can use literally any form of text editing. We use IDEs because they make the job easier.