Valve gave the modders, collectively known as Vortal Storm, permission to use its famous franchise and its materials to build the game, so all the characters, logos and terminology from Half-Life are present and correct. You play as either a commander of the Resistance or as an overlord of the Combine, with both factions including units, abilities, buildings, research and defences. Lambda Wars is a free standalone multiplayer mod for Valve's 2010 multiplayer top-down shooter Alien Swarm (which is itself a remake of a mod for Unreal Tournament 2004) set in the Half-Life 2 universe that brings Valve's first-person shooter masterpiece into the RTS genre. Half-Life 2 real-time-strategy game mod Lambda Wars has finally left beta and launched proper on Steam - 13 years after development began.
