Visplane Explorer is a program to visualize possible visplane overflow errors in DOOM maps. This version adds support for viewing other overflowables: DrawSegs, SolidSegs and Openings. The drawsegs view is particularly important, since there are places in maps where these overflow but visplanes don't. The openings are not very important, they very rarely come close to overflow and when they do, the drawsegs or visplanes are already very high (often many times the limit