Planet Gloom
http://www.planetgloom.com/
Gloom is a mod for Quake II, not a standalone game. You require the full version of Quake II to be able to play gloom. For your convenience, the Quake II demo and the 3.20 retail patch are available on the PlanetGloom FTP.
The Gloom .pak files are optimized with PakOptimz to remove redundant data, allowing for smaller file sizes and faster load times. Some pak file editors are incompatible with this modified structure and will corrupt the pak if you attempt to edit it. PakExplorer users should ensure that the "Recover free space automatically" option is disabled as this will cause optimized .pak files to become corrupted simply by opening them.
Gloom 1.3 Full
(27 Mb)
Gloom Server Browser
(32 Kb)
All Map Pack
(297 Mb)
Full installer for Gloom version 1.3. It is *highly* recommended that you delete your existing gloom files (except custom maps/textures/env etc) and use this to install gloom 1.3 to avoid potential conflicts with older files. This contains everything you need to play Gloom except custom maps. Visit the Gloom Map Depository, http://www.planetgloom.com/gmd/ as needed or grab the All Map Pack below for your custom map needs.
The Gloom Server Browser. Easiest way to immediately find all Gloom Servers and get straight into the game.
Regularly updated map pack, containing almost every custom made gloom map in existence. Not one for the modem users! Once downloaded, extract the .pak files to your gloom directory. This pack contains all maps up to the 19th December 2004.