1997 E1-style single-player episode for Quake, that features 8 small to medium-sized levels as well as a new start map - all of which also support co-op mode and deathmatch - a few new textures, and a modified Chthon boss.
A 1997 medieval and base-themed classic episode with four medium-sized maps as well as a start-map and a small secret level. Quite hard and challenging at times. Made by the Casali brothers, of Final DOOM fame.
Hell Revealed (HR.WAD) is a 32-level megawad for Doom II, released on May 2, 1997. It was created by speedrunner Yonatan Donner and his friend Haggay Niv. This megawad was designed with full skill level support to allow unskilled players to complete it, and yet also provide "extreme challenge" for the best players.[1][2] The latter is the best-known feature of Hell Revealed, with the result that it has had the most speedruns recorded of any PWAD. Thus, it is one of a few PWADs that are legal for competition in the Compet-n. A sequel, Hell Revealed II, was released in late 2003, created by a new team with Yonatan Donner's approval.
Duke Nukem's Penthouse Paradise is an official add-on level for Duke Nukem 3D, jointly published by Penthouse Magazine and GT Interactive. It is free to download and can be played with either the original version of Duke Nukem 3D or the Atomic Edition. It was conceptualized and developed by Jeffrey D. Erb and Mark Farish of Intersphere Communications. It was released on May 1, 1997 on GT Interactive's and Penthouse Magazine's respective websites.
Penthouse Paradise is the only official add-on for Duke Nukem 3D that is available for free.