The Infocom archive is really good for this https://archive.org/details/infocomcabinet https://archive.org/details/infocomcabinet. The Deus Ex design doc was r

The Infocom archive is really good for this https://archive.org/details/infocomcabinet https://archive.org/details/infocomcabinet. The Deus Ex design doc was released http://www.gamasutra.com/view/news/285520/Annotated_version_of_an_original_Deus_Ex_design_doc_surfaces.php http://www.gamasutra.com/view/news/285520/Annotated_version_... along with some other in development Ionstorm games that never shipped. Nintendo released some early design sketches for classic games like Super Mario Bros and Zelda which are interesting to look at. https://www.nintendo.co.uk/News/2016/December/Take-a-look-behind-the-scenes-with-design-documents-from-The-Legend-of-Zelda--1169414.html https://www.nintendo.co.uk/News/2016/December/Take-a-look-be....