What makes Doom + Doom II such a great piece of video game preservation, then, is that it fully embraces Doom‘s legacy as a fan-created phenomenon. Besides including pretty much every official id Doom title (which already includes a number of fan-made levels curated together by the studio in the years after Doom‘s initial 1993 release), it also collects together some of the best of the best of the thousands of mods made for both games. Critically, the presentation of this huge glut of content includes a focus on curation, with notes providing the user with historical information, and even critical appraisals, of the huge number of levels included in the title. The package also includes a nifty “id Vault” that contains more traditional making-of content, including old unused textures and design notes, but the presentation of the levels themselves is the real prize exhibit here.