The id software source code gets increasingly cleaner for each game I think. I've read the Doom source code and Quake II's. I remember Quake II being very clean

The id software source code gets increasingly cleaner for each game I think. I've read the Doom source code and Quake II's. I remember Quake II being very clean and elegant. Doom is not quite there. It's fairly well organized, the functions are generally short and concise, but it's a mess of global variables.