I've been playing this game at least occasionally since I got it in 1998 and I consider it my all-time favorite video game, thanks in large part to all the user-made addons and levels. (And I've made a few of my own.) But I never did get the Reckoning and Ground Zero mission packs. This GOG edition was a quick and convenient way to obtain them, compared to trying to scrounge up copies on ebay or hoping to run across secondhand copies at the thrift store. The original version of the game runs fine on newer computers as far as I can tell (at least on windows 8.1), as does this version. Don't forget to go to the video menu and select "default OpenGL". Some users, however, do like the rougher look of the software mode, although transparency became completely broken with version 3.20 (and resolutions higher than around 1024x768 may crash). The GOG version includes a launcher program that simplifies starting the mission packs or the mods in the Quad Damage package. As for Quad Damage, it's a collection of user-made multiplayer mods originally freely available as downloads but which may be difficult to find now. Also included are the TRDM* and ZTNDM* map series (these appear to be part of Quad Damage) and the 64-player id Software DM maps.
