Game logic and game rules exists in all computer games, but they are created di erently for all game engines. This game engine dependency exists because of how the internal object model is implemented in the engine, as a place where game logic data is intermingled with the data needed by the low- level subsystems. This thesis propose a game object model design, based on existing theory, that removes this dependency and establish a general game logic framework. The thesis then expands on this logic framework and existing engine design theory to create a concept of a genre-independent engine that can provide an alternative to the normal game engine. This new genre-independent alternative is referred to as a game mechanics engine