When Freeman steps out of the shadows, an adaptation to bright light will take place for a few moments.
The engine allowed for a realistic transition between dark and light areas. Later, this idea migrated to Nova Prospekt. The idea behind Half-Life 2: Lost Coast was to show the difference between human buildings and buildings created by an alien race. The architecture has features of oriental culture and differs from the main game.
Initially, the level was supposed to enter the Highway 17 chapter, the purpose of which was to present the player with artillery cannons firing headcrabs. The hero's task is to get to the church, destroy enemies, a helicopter and an installation that spreads monsters. Gordon Freeman, waking up on the coast of the city, learns that the Alliance have taken over the local church and control the territory with the help of headcrabs.
Olga where Half-Life 2 will take place: The Lost Coast has been removed from the main game. Half-Life 2: Lost Coast - a technical demo created to demonstrate the capabilities of the updated Source engine.