I didn&#x27;t use an existing framework, other than OpenGL. The game engine that I&#x27;m using is my own and is something that I&#x27;ve been working on since 2010.<p>I think I was not very clear but the collision engine, rendering engine, physics engine, and graphical user interface engine have already been built and all of them make up my game engine.<p>What I actually built in two months includes the game design, game mechanics, the specific user interface for this game, and the graphics.