Hell Revealed is a megawad, a 32-level replacement for DooM II, created by Yonatan Donner and Haggay Niv. In Hell Revealed, you will find: 32 new high-quality very detailed levels, many new graphics including textures, flats, skies, status bars and others, full skill-level support and additional attention to coop-players, and extreme challenge.
A fun megawad to play, and I like the music from Rise of the Triad.