This thesis describes the implementation and evaluation of a modular approach for generating 2D side-scroller game levels from a procedurally generated 3D world. Manually generating large amounts of game levels can take considerable amounts of time, and it maybe desirable to automate this process, using procedural content generation. The problem with using procedural content generation is that it is hard to generate coherent game levels. We implement a modular pipeline which, given a set of heightmaps, generates a 3Dworld. From this world, 2D game levels are generated by pathing and extracting terrain features which influence the content in the game levels. The resulting 2D game levels will, using our approach, have a coherent and logical look. The game levels themselves do not contain any interesting gameplay. Instead they rely on a game level designer to add gameplay elements. The resulting modular implementation is considered a success, it proves that it is possible to generate 2D game levels from a procedurally generated 3Dworld, using the features of that world.