Black Mesa: Definitive Edition - 17c - Interloper [Hard] 

Chapter 17: Interloper - Part Three
Freeman continues to make his way through the alien factory in Nihilanth's Tower, following a complex series of conveyor belts and jump pads transporting pods of Alien Grunts to the top of the tower. However, he runs into more Xenians as he progresses at every level of the structure, and is forced to deal with their numerous traps, ambushes and a deadly conveyor gauntlet as he climbs.
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Notes:
The water at 1:26 is home to many Icthyosaurs, more than the 2 seen in the video - each section of the pool separated by land contains its own pair of Icthys
The Vorts in this chapter will not be provoked if not actively under mind control, even if Freeman shoots them (2:33)
The purpose of the portals that open at receptacles such as at 3:01 are to provide a means for Freeman to quickly return to his current point of progress if he falls down to the lower levels where he started. For instance, the 3:01 portal links to the one at 2:02 in the event Gordon falls down to the water
The jump that I did at 3:52 is, to my knowledge, not the intended path for the level. It is expected that players drop into the vent at 3:48, which leads into the map's first laser puzzle. However, I wanted to show Gordon's ingenuity and ability to think on his feet, which is why I opted to go for the "skip" (that and I was honestly sick of laser puzzles at this point). Regardless of the path chosen, both lead Freeman to the portal at 4:13
As opposed to what I did to jump onto the stamping machine at 5:20, Gordon can simply jump onto the part of the machine that drops to the floor (shown in the blue light at 5:15)
As shown at 10:47, breaking an Alien Pod (whether intentionally or due to the Controllers) releases an Alien Grunt without its armour or Hivehand. This variant was first encountered encaged in the opening moments of Questionable Ethics, and can only attack Freeman by charging at him
As shown at 11:42, many Vorts are in close proximity to the exploding green sacs at the conveyor gauntlet - this is why I actively avoided detonating them
There are multiple paths in the conveyor gauntlet (11:56) that Gordon can utilize to reach the end
As shown at 12:05, Gordon can shoot through forcefields, while the Controller's own attacks cannot
Freeman can get into the shower with the Vort at 14:18 to share the heals without having to kill it
Shielded Controllers, first encountered at 15:26, is a new addition to Black Mesa's rendition of Interloper
If Gordon does not kill the Controller that shuts the gate at 16:01 quickly enough, it will break the pods in the room to release the agrunts
If Freeman launches himself off a jump pad too close to an Alien Pod, he will receive impact damage from it
As shown at 20:54, the Tau Cannon's piercing abilities is very effective for destroying the shielded crystals (thanks to user requem90 for originally pointing this out in my 2019 video of the chapter!)
Unfortunately, Freeman cannot shoot through the forcefields containing the switches at 21:10 to disable the switch
Apologies for the lag at 25:06...this section of the game isn't optimized well and every time I look into the forcefield at 25:05 I lose frames. I tried to smooth this out as best as I can
Trivia:
Very rarely, the timing of the alarm and subsequent forcefields to jettison Freeman from the belt at 0:52 can trap Freeman against a Pod, crushing him
The sequence at 8:02 where Freeman must avoid security measures on the Pod is, in my opinion, reminiscent of a similar sequence in the game Doom (2016) where the Doom Slayer retrieves the BFG
The crystals that power the Controllers' shields at 15:26 seem to be the same crystals that power Gordon's HEV suit
Very often, any Alien Grunts that break out of their pods during the conveyor gauntlet at 10:26 will be killed by a Pod squishing them against the forcefields
It is implied that the three laser puzzles that Freeman has to complete starting at 21:18 are used to carve out new tunnels in the Tower
As seen very quickly at 27:12 as Freeman takes the jump pad up, there are numerous structures that can be landed upon if players jump back down off the ledge at 27:20, though they don't really have any points of interest and serve only to house the three chambers in the map
The area with the three gates at 20:38 will lock after Freeman completes the gauntlet, preventing him from accessing them again
If Freeman breaks an Alien Pod just as it touches the jump pad at 27:35, the Alien Grunt that is released will be instantly killed
Nihilanth's line at 28:30 is not in the base game, and was added in with the workshop mod "Restored Nihilanth Quotes", as suggested by user UGLIES

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