DEU 5.21 & BSP 1.1 (binary space partitioner) (Special thanks to the creators of both programs; Raphael Quinet and Colin Reed)
DARKHELL.WAD has been extensively tested on Doom engine 1.2. No errors.
On Doom 1.666, and above, there is only ONE known error. In a particular square sector on map 2,6 (BEWARE), Doom may crash with some type of "Undefined Sector Error". It is still unknown why this occurs, and is unresolveable.
It is _NOT_ neccesary to enter the sector to complete BEWARE.