I am looking for video games that only contain Assembly language or/and C (not C++) language in their source code.
The best example of this that I can think of right now is RollerCoaster Tycoon (1999), as far as I know this game is written only Assembly language and the developer had to make an unusual effort to finish it.
It does not matter what genre or year the game is from, the only thing that matters is that it has been written with these languages, but if it is a 3D game much better.