Half-Life 1 (Blue Shift and Opposing Force are optional) Half-Life 2 Half-Life 2: Episode One Half-Life 2: Episode Two Half-Life Alyx. Lost Coast was a cut chapter from HL2. It would fit somewhere around the "Highway 17" chapter of HL2 but as it stands it doesn't fit super well anywhere. Lost Coast is just a HDR tech demo, it used to be a cut chapter of HL2 that placed somewhere in Highway 17. Normally cut content aren't considered as canon. However for Lost Coast, canon or not isn't too important because it didn't affect the storyline at all. Btw, in HLA you can find . Snoo_1567 • 2 yr. ago. I think it was actually meant to 23 Mins Main + Sides 27 Mins Completionist 28 Mins All Styles 24 Mins Originally planned as a section of the Highway 17 chapter of Half-Life 2, Lost Coast is a playable technology showcase that introduces High Dynamic Range lighting to the Source engine. Platforms: Linux, Mac, PC Developer: Valve Corporation Publisher: Valve Corporation NA: avbrD51.