NOTE: Apparently most if not all of these maps have been available to the public for some time. Still, they're fairly interesting, at least to someone like me who hasn't seen them before.
So Postal 3 leaked earlier and with it, a bunch of content related to HL2's episodes and TF2. I decided to record some of the strange maps in there, the dev test maps and the style guide maps. Now I don't actually know what these are from but my guess is Episode 1 based on the content within them, and where the map files are located. I'm guessing that the reason for going third person, issues with sprinting, and issues with animations and hit registration all have to do with this being part of a Postal 3 leak. Basically it's trying to put the dude in HL2 and I'm not sure how I feel about that. Thanks to InsDel for providing a fix that makes these maps playable. I hope this can provide some value. The wasteland test in particular interests me because it seems to be connected somehow to the wasteland concept from the HL2 beta. It wasn't any fun to actually play though, so I started cheating. I'd encourage you to find this and give it a look yourself, there could be some really interesting stuff in this.
Oh, also, sorry for the bad bitrate, I had issues with exporting and kept having to lower it until it worked. Check out some of my other Half-Life videos, which don't have this problem. I'm currently doing analysis videos on Half-Life 1.
Discord: / discord