This PC mod, released in 2017, offers a curated compilation of classic Doom maps from the golden age of modding, spanning roughly 1994 to 2005. It acts as a gateway to over a thousand levels across 54 distinct map packs, all meticulously remastered to ensure compatibility with modern ZDoom-based source ports. The project's core appeal lies in its comprehensive collection and technical polish, making a vast library of fan-made content accessible and functional.

The Essence of Classic Doom Modding

This mod presents a significant collection of fan-made levels, often referred to as "wads," that were popular during the formative years of Doom's modding scene. The developer has undertaken the task of updating older maps, converting outdated coding methods to more modern ZDoom scripting languages like DECORATE and ACS. This process also includes bug fixing, specifically addressing issues that could prevent players from progressing through levels, and improving multiplayer stability.

What is Compendium?

Compendium is, as its name suggests, a compilation. It brings together a hand-picked selection of highly regarded Doom maps and map packs from a specific era of community creation. The goal is not to alter the original author's vision but to provide a unified and improved experience. Each included map pack is accessible through a central hub map, allowing players to seamlessly transition between different collections of levels. Upon completing a map pack, players are returned to the hub, retaining their acquired arsenal for the next adventure.

A Unified Experience for a Vast Library

One of the primary advantages of this mod is the enhanced compatibility it offers. By consolidating 54 individual map packs, players no longer need to manage separate downloads and load orders for each wad. This is particularly beneficial for those who enjoy using gameplay modification mods that introduce extensive weapon systems or progression mechanics, as it simplifies the setup process. For multiplayer enthusiasts, this consolidation means hosting a single, unified server for a multitude of levels, rather than managing numerous individual instances.

Variety and Discovery

The selection of included map packs showcases a wide spectrum of Doom modding creativity. It features well-known megawads from the era, such as Memento Mori, Obituary, and STRAIN, alongside those that leveraged ZDoom's advanced features, like Daedalus and Project Slipgate. The collection also includes innovative gameplay experiences found in mods like Cyberdreams and All Hell is Breaking Loose. The levels range from expansive, time-consuming maps to fast-paced, action-oriented arenas, offering a diverse gameplay experience designed to appeal to various player preferences. The project also aims to highlight lesser-known but high-quality maps that may have been overlooked.

Technical Enhancements and Accessibility

Beyond compilation, the mod addresses the technical obsolescence of some older map packs. Many were distributed with outdated DOS installers and relied on deprecated methods for introducing gameplay changes. This project provides a modern repackaging, ensuring these classic maps can be enjoyed by GZDoom users without the technical hurdles that previously existed. The remastering process includes code conversion and bug fixing, making these the most polished versions of these wads available.

Core Gameplay Mechanics

The core gameplay remains true to the original Doom II: Hell on Earth experience, focusing on fast-paced first-person shooting, exploration of intricate levels, and strategic combat against hordes of demons. The mod enhances this by providing access to an extensive library of levels designed by the community, each offering unique challenges and layouts.