Many third-party creations have been released to work with the Marathon engine, and within the Marathon framework. There have been sound patches, to alter (or augment) the sounds Bungie released with the game, music patches, to add different background music, shape patches, to alter the way some characters look, new maps, and entire reworkings of the Marathon environment, with some combination of the above. They all fit into two categories, though: enhancements made to fit into the Marathon storyline, or enhancements made to alter the stock Bungie characters such that they would fit into a new worldview. We asked:
