Codename Gordon and other games hidden on Steam
Codename Gordon is not HL3 but a fun game in its own right and there's nothing wrong with free.
Then we have of course the notorious Spacewar, a port of the first computer game which is now used to run illegal game copies on Steam.
In fact, there's a whole slew of games free to download if you're interested:
Age of Empires online {Servers down} steam://install/105430
Arcane Saga Online steam://install/238110
Arctic Combat steam://install/212370
Arma 2:free version steam://install/107400
Battle for Graxia steam://install/90530
Brawl Busters steam://install/109410
Bullet Run steam://install/211880
Codename Gordon steam://install/92
District 187 steam://install/221080
Dungeon Fighter Online steam://install/212220
F.E.A.R. Online {Servers down} steam://install/223650
Fnaf world steam://install/427920
Haunted Memories steam://install/241640
Maple Story(US-version) steam://install/216150
Pandora Saga steam://install/106010
Renaissance Heroes steam://install/221790
Rusty Hearts steam://install/36630
Spacewar steam://install/480
TERA steam://install/389300
TERA EU steam://install/323370
Vanguard: Saga of Heroes F2P steam://install/218210
Wizardry Online steam://install/221360
Steam Region Lock Games or removed from steam list (all F2P)
Forge https://steamcommunity.com/app/223390
Warface https://steamcommunity.com/app/291480
Vindictus https://steamcommunity.com/app/212160
Bullet Run https://steamcommunity.com/app/211880
Dirty Bomb https://steamcommunity.com/app/333930
Dragon Nest http://steamcommunity.com/app/11610
Arctic Combat https://steamcommunity.com/app/212370
Metro Conflict https://steamcommunity.com/app/356640
F.E.A.R. Online https://steamcommunity.com/app/223650
Brick-Force (US) https://steamcommunity.com/app/272490
Fiesta Online NA https://steamcommunity.com/app/300970
Atlantica Online https://steamcommunity.com/app/212240
Sin of a Dark Age https://steamcommunity.com/app/223390
DC Universe Online http://steamcommunity.com/app/24200
Arcane Saga Online https://steamcommunity.com/app/238110
Chaos Heroes Online https://steamcommunity.com/app/290830
Quantum Rush Online https://steamcommunity.com/app/304890
Rise of Incarnates http://steamcommunity.com/app/258160
Dragon's Prophet (EU) https://steamcommunity.com/app/259020
Age of Empires Online https://steamcommunity.com/app/105430
Dead Island: Epidemic http://steamcommunity.com/app/222900/
Dungeon Fighter Online https://steamcommunity.com/app/212220
Zombies Monsters Robots http://steamcommunity.com/app/306830
Heroes and Titans: Online https://steamcommunity.com/app/407090
Ragnarok Online - Free to Play - European Version https://steamcommunity.com/app/250740
How to install the goodies? Your Steam client has to be online. Open Firefox, Chrome doesn't work and type in the address bar without 'http':
steam://install/XXXXXX where XXXXXX is the AppID of the game, e.g. steam://install/92 will open the Steam Bootstrapper in your client and if you give the o.k. it will begin to download the game.
At the moment I'm downloading TERA from Steam which is still sold on Amazon for $22.90 https://www.amazon.com/Tera-Online-PC/dp/B002I0HJG8?th=1
So happy downloading keep the Steam servers busy.