Half-Life²:SUBSTANCE GOLD gives your single player games harder challenges and hectic action: 4 gamemodes to test your skills with, a wide array of weapons and 5 different player classes to best suit your gaming style. Welcome to the real Substance, what action is made of! Features: - New single player campaign modes: European Extreme,Gordon Tales and Survivor. Aka legendary difficult,more battles and health management: Survivor gives you shields like in Halo and takes away most of the health packs making life leeching necessary - an error too many done in the canals could prove fatal only in the citadel; - Gameplay additions: bullet time + fast reload as in Max Payne 2, gruesome new gibbing system,friendly fire,open wounds, Critical Hit System as in Shogo (score headshots,win health!), the weapons' weight affect your walk speed, fast Punch button, crosshair disappears if you don't slow down, alternate firemodes, allies spawning, enemy conversions, incendiary/dark energy shells,...
Back in the golden days of hl2 modding, this was something I played multiple times, and looking back at it, I sincerely wish I could go back for more :(
The new additions to the hl2 campaign struck me with surprise and awe and the dozens of new weapons made the action tight and refreshing, with new additional monsters and player abilities to decimate them with.
It's a shame this only partially works with mod fixes following the may 2010 update. Perhaps someone with some free time on their hands is willing to give it a fix. But I know that probably won't ever happen.
It's a sin and shame, but at least I still have great memories booting this up for the first time :)