I have the files and everything but it shows a black screen pls help i just wanna play quake 3 
Sorry to hear it’s not working 
What device are you using? In my experience, a game showing a black screen is often associated with an incompatible graphics library. However, I don’t know much about idTech4a++ so I might be entirely wrong on this.
better ask here: https://github.com/glKarin/com.n0n3m4.diii4a/issues