Doomworld page on editing tutorials (old) Doom Builder video tutorials (old but the basic concepts are all still relevant) Doom Builder: An Illustrated Guide (PDF from 2004 by Dr. Sleep, an OG mapmaker who made E4M7 in Ultimate Doom) Doom Builder video tutorial series by Chubzdoomer (old, but often recommended) Realm667 Tutorials page Doom editing tutorials by Blzut3 SLADE level editing tutorial by Eevee E