Named Game of the Year by over 50 publications, Valve's debut title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world. Key features Half-Life Complete includes: Half-Life Half-Life 2 Half-Life 2: Deathmatch Half-Life 2: Episode One Half-Life 2: Episode Two Half-Life 2: Lost Coast Half-Life: Blue Shift Half-Life: Opposing Force Half-Life: Source Team Fortress Classic
1. Download, install and run installer STEAM.
2. After the game run, create your STEAM account according to instructions on screen, after that go into tab Games, options for product activation on Steam, copy the game bought game key from your KeenShop account
3. After this procedure the game and it's parts is present at Games tab.