About This Game. Swelter is a story-driven modification for Half-Life 2, with events taking place a few years before Gordon Freeman's arrival in City-17. The summer sun had been heating the lands of Central Asia long before the Combine's appearance, but in recent days, the heat arises from another source. A series of armed riots in City 545 has The Gravity Gun was a game-changer, allowing you to take advantage of Half-Life 2's sophisticated physics by picking up, manipulating, and throwing objects, resulting in some hilarious and jaw That is, until the Rebels step out against the Combine: barrel-chested, leather-skinned and bloodthirsty—an inevitable eruption of gunfire, pulse orbs and exploding frag grenades follows. Since Granted, Half-Life 2 is a big game, and even Jasper's trick doesn't manage to capture the entire thing in one image. They've given it a good shot with Noclip's isometric view, though, which helps 1 - Download and install the Steam client on your PC. 2 - Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”. 3 - Enter your product key that appears on the email and follow the instructions to activate it. 4 - Your game is now viewable in the “Library” tab gkoSsSU.