*************************** What is it for? *************************** Declare here the new floors and ceilings you want to put in a PWAD ALL THE FILES PUT HERE MUST BE DECLARED IN THE PWAD CREATION DIRECTIVE. Suppose you want to put MUDDY.BMP and HATCH.BMP as a new floors and ceiling, just declare it in the FLATS part, like: Begin: FLATS MUDDY HATCH End: FLATS and DeuTex will look here for MUDDY.BMP and HATCH.BMP TO MAKE USE OF YOUR NEW FLOORS, YOU MUST MERGE YOUR PWAD WITH DOOM.WAD OR USE DEUSF TO REGENERATE ALL THE FLOORS OF THE PWAD sorry, but it is a limitation of DOOM, not of DeuTex. the FLATS inserted here will not crash DOOM if used as PWAD (because I don't use the regular F_START F_END delimiters that confuse DOOM) but of course your level will fail if it contains references to those Floors.