Altars of Madness is a set of 12 Doom 2 maps in Boom format created by me over the course of a few months. The target source port is prboom+ but we tested in a variety of sourceports. The maps are relatively small and can be beaten in under 10 minutes. Each map is designed to be pistol started, and a death exit is placed at the end of each map to force this (sorry continuous players).