Half-Life 2: Lost Coast is a playable technology showcase that introduces High Dynamic Range lighting to the Source engine. It is included with Half-Life 2, purchased on Steam. Originally planned as a section of the Highway 17 chapter of Half-Life 2, Lost Coast follows Half-Life protagonist Gordon Freeman as he travels up a coastal cliff to destroy a Combine artillery launcher in a monastery, which is firing on a nearby town.
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I looked online, and it would appear to be that "Half-Life 2 Ultimate mods collection" has something to do with online piracy (torrenting mainly.)
Also most of what is seen on the launcher can be ran through Steam Library as well.
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