Orange Box Walkthrough

Half-Life 2 Walkthru/FAQ
hexrei@NOSPAMPLEASEnwtekno.org
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Feedback/Contributions
Any additions, corrections, or comments can be sent to me via email.
I will be glad to include your information and give you written credit
for your submission.
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Revisions/Updates:
1.3 Finished Chapters 10 and 11, minor corrections
1.2a Further updates
1.2 Finished Chapter 9, most of Chapter 10, minor corrections and
additions
1.1a  Finished chapter 8, most of chapter 9, minor corrections and
additions
1.0b. minor spelling revisions and clarifications, revisions,
1.0a. release. Chapters 1-7 Finished
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Authors Note
I played this game through on Difficult, so things may be slightly
different on lower modes. Generally, things should be easier, but feel
free to send me notes about differences for inclusion.
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Walkthrough:
Chapter 1
Point Insertion
Wait through the G-man's little speech. You find yourself in a
passenger train car outside City 17.  Listen to Breen for storyline, or
not. I like to play a little game here called "Beat the Civil
Protection goon". Grab a suitcase, box, etc with your use key, and then
throw it at the CP's head. Fun! He'll chase you around with his riot
prod for a while- don't worry, he can't hurt you much.
Pass through the rotating door, then follow the hallways to the room
with departure/arrival times listed. Enter the caged area, go where the
CP's prompt you. You will end up in a small office where the CP leading
you reveals himself to be Barney, from HalfLife 1.
Exit through the back door, climb the ladder, then put a box in front
of the window so that you can climb out.  Follow the obvious path until
you reach the guard who knocks the soda can off the trash bin into the
floor. Pick up the can and place it in the trash. I prefer to pull it
back out afterward and lob it at the CP's skull. Sure, it earns you a
riot prod jab, but it's worth the pain.
Exit through the front door of the train station, then head right down
the street. Take the a right into an alley where you can climb a ladder
to a catwalk to pass over a fence. Continue through the alleys to a
courtyard, where a door to a building is open near some CP's standing
guard. Enter the door, then go upstairs, where a squad of CP's are
raiding an apartment. Head to the end of the hall and go up the stairs
to the next floor, where a man will be trying to get your attention.
Follow him, and start running!
Chapter 2
Red Letter Day
Guards will be after you now, so run to the end of the hall go up yet
another flight of stairs. A man will be waiting here for you to enter
before closing a door. Do this, end then follow the stairs up to the
attic.
Exit through the rend in the attic wall, and leap to the next roof.
Either skirt the gutter or run up the ramp to the next roof's gutter,
where you will have to walk a long ledge under pistol fire until you
reach an open window. Downstairs, you will meet Alyx Vance for the
first time. Cute for a pile of polygons!
Follow her into the elevator and then down the hall, where she will
open a door for you and then tell a little bit about the history of the
world since the alien invasion. Go through the soda machine cum secret
passage to the laboratory, and meet Dr. Kleiner and his de-beaked pet,
Hedy Lamar.
Watch the antics for a bit if you wish, then hit the button and slip
into your HEV suit. Comfortable and utilitarian! Dr. Kleiner wants your
assistance in sending Alyx, oblige him by fixing his blown plug and
flipping the switch. Listen to Barney's sass, then hop in for your own
trip through the teleporter. But oh no! What is this? Something going
not quite as  expected? In a teleporter machine? In Half-Life?
Unforseeable!
You'll end up on a catwalk behind a building in City 17. Avoid the
scanners and weave your way through to a door blocked off with boards.
Listen to Barney and obtain a crowbar. Deal with the boards, Freeman
style.
Cue thumping beats, cue squads of CP's firing at you while weaving
between train cars. They are mostly hiding out of reach- don't bother
with them unless you are a masochist. Just find the train car with the
ladder up, be sure to avoid the passing train,  and then leap off it to
the next car, then over the fence to a door with more boards to dispose
of.
Chapter 3
Route Kanal
Exit into a hallway where a man is being beaten by guards while a woman
screams. Beat down the CP's and get a pistol with which to smite thine
enemies. Go up the stairs and shoot the surprised enemy there. At the
bottom of the next staircase, put a few bullets in the head of the guy
at the top.  At the top of the stairs, wait for the train to come, then
leap on top of it. From there, jump to the opposite side of the
trainbed.
Blow up the CP's that appear via the handily-placed exploding barrels
near all their firing positions. Break open the doorway to the house,
then run through to the rear, where more CP's will be awaiting their
fiery dooms. Climb over the broken fence section and run toward the
alley. Crouch to enter the vent and follow it to its end. Enemies will
fire from the train across the way. They should fall after 3 or 4
headshots even on Difficult mode.
Jump down into the train bed, kill more guys, go up the stairs and
avoid the rolling exploding barrel. Keep heading up the stairs, down
the hall, and then up more stairs, killing CP's all the way. Break the
boxes blocking your way and then go down the stairs and jump down to
the train tracks. Kill the guys charging from both directions, make
sure to use the health station to refill, grab the boxes of goodies,
and then bail off the tracks into the aquifer running parallel before
the train makes you into a pancake.
Swim to the end, then climb into the abandoned boxcar and listen to
what the two characters have to say. They will provide an exit out the
back- take it. Break the wood blocking the way, then walk past a rolled
semi to watch a barnacle devour a crow.
The best way to get by a Barnacle without wasting ammo is to pick up a
junk object and toss or place it onto it's tentacle. Then pass by
unharmed.
Watch the poor humans get slaughtered by the nasty combine turret.
Assuming you don't want this to happen to you, take a quick right, stay
behind the boxes, and head into the tunnel entrance to your right.
Follow the tunnel, and you should come up behind the CP, in perfect
position to take them all out. Don't miss all the goodies around and
below the Combine turret position!
Man the turret and kill CP's if you like, but make sure to shoot the
barrel suspended on the rail to the right, in order to complete the
walkway. Then follow that walkway back over the wreckage. Watch out for
barnacles!
Keep following the tunnels past another resistance member to a room
full of water. Jump in, grab the supply boxes, and wait for the enemy
to drop exploding barrels in. Dive to the bottom until they've
exploded, then jump through the hole they blew in the tunnel grate.
Follow that tunnel to it's end, then move out into the junkyard,
watching for enemies above. Take out the bridge with the exploding
barrels at the base, then find the section of caved in tunnel with
three barely-visible barrels blocking the tiny gap, and push the barrels
to gain entry into another tunnel.
Careful, the ground is slippery and barnacles are all over the place.
Don't bother wasting ammo unless you enjoy it, just toss debris into
their line and move on.
Jump out into another aquifer, kill enemies as best you can among the
barrels being flung at you, and then climb the ladder over the fence
into the next section of water.
Climb the ramp then leap from dock to dock until you enter another
tunnel.
One of your first physics puzzles is here. Place blocks onto the
shorter end of the seesaw so that you can use the opposite side as a
ramp up to the next area.
Take the first left, and avoid the helicopter. Once you get to the
junkswamp area, start running like mad  from cover to cover, avoiding
helicopter fire. Take the left unless you really need the health to the
right. Follow the walkway up to the door, move the barrel, and enter.
Follow the hall, and make sure to go down the ladder first to get the
health before heading up toward the supply crate. Crouch at the left
end of the waterway and follow it to the end for more health, if you
need it.
Head right and then down the long slippery passage full of barnacles,
then jump the railing to the left. You will find another long slippy
passage full of barnacles. Grab the exploding barrel nearby and roll it
down the passage. Let a barnacle grab it, then shoot it a few times as
it pulls it up. A few less barnacles to deal with. Jump the railing at
the bottom to the left, then follow the hall to the doorway.
Head left out the door to the end of the catwalk. The helicopter seems
content to watch for now. Take a left into a stone hallway. Follow the
hallways through a loading screen to   a bunch of debris that must be
destroyed to move further. Do this, then continue and bust through the
barricade to another resistance member who will give you more
information.
Use your crowbar to thrash the manhacks that come crashing in, and make
sure to grab the two supply crates and the cache in the upstairs corner
before leaving.
Open a chainlink gate and destroy more manhacks.
Follow the passage further, make sure to hit the small supply room here
if you're low, then head outside briefly. Move the barrel and enter the
next door before the manhacks arrive. Close the door, and then jump
downward to the sewer. Kill the enemy that drops down and take his SMG.
Kill the rest of the enemies that appear, then detonate the barrel
blocking the lower passage. Crouch to enter the passage. Crawl to the
end and meet your first zombie. Exit and kill more Combine troops, then
jump into the giant mixer at the end of the passage.
Swim to the tunnel on the left side of the mixer pit, and follow it
down, stopping for air as necessary. Exit at the top of the water
tunnel and then follow the big pipe, killing CP's as they appear. Climb
up at the open-air end of the pipe, and then run back down the pipe to
the end of the hall.
Watch out for the steam vents here, and the barnacles nesting above it.
It's best to simply kill the barnacles before attempting to move
across. Make sure to grab the health on the ledge nearby!
Run to the end of the pipe, break the boards to the right, then drop
down and crawl under the pipe. Kill the manhack and grab the goodies.
Crawl back under the pipe and look for a vent. Drop down the vent into
the water, then swim out and climb the ladder.
The troops with the truck at the top will roll exploding barrels down
on you. Try to shoot the first one before it hits the ground, that way
they all explode on the enemy. Take the right, kill more troops, then
duck into the stone hallway. Follow it to the end, into the room with
the red lighting. Grab the supplies and then crawl into the vent. Drop
down, break the tile, and and you'll fall through onto some barrels.
Watch out, there's explosive barrels everywhere, and manhacks will be
flooding into the room soon. You can climb the incline in the corner,
and be safe from the majority of the explosions as well as having your
back to the wall for fighting manhacks. Also, up on that ledge, you can
jump from the railing to the pipe which is easier than jumping off of
the ladder to the pipe, in my opinion.
Jump from the pipe to the opposite walkway. There is a vent up here with
an item in it.
From contributor Shorty:
#I managed to get in after some messing around. It's a +15 powercell.#
Thanks Shorty!
From contributor Frimp13:
#he way to get to that vent is to pick up a barrel, stand it up
straight (by leaning it against another barrel, etc.) and place it on
top of the pipe while standing on the ledge.  It works best if you sort
of lean it up against the stone pillar.  Then go up onto the pipe via
the ladder.  Carry the barrel over to where the pipe bends and stand it
up against the ceiling beam.  Jump up onto the barrel and then from the
barrel onto the ceiling beam.  From there, leap across to the vent -
pressing crouch AFTER you jump.  There's a small power-up for your suit
in the back of the vent (kind of disappointing after all that work.)
-Frimp13#
Thanks Frimp!
Go through the door and jump down the opposite side of
the central pipe, so that you land on the ledge next to the valve. Turn
the valve, or jump down one more pipe and turn it if you can't reach.
Swim up and back into the manhack room, and then down into the area the
manhacks came from. Swim into and through the pipe.
Break all the boards at the bottom so the cable spools can float to the
top, and hop across them (using turbo if necessary) to the opposite
side then up the stairs.
Climb the ladder and run across the boards to the ledge, then drop down
into the water on the other side of the fence. The right is a dead end
with no redeeming qualities but some manhack baseball. The left will
find two soldiers rappelling down and a manhack to back them up. Head
left fast, if you reach the soldiers before they hit the ground you
won't take too much damage then you can focus on the manhacks.
Jump up onto the ledge to the left, be prepared to kill a manhack and a
scanner. Grab the supply crate, too. Head dead straight down the hall
skipping the doorway on the right for now, grab all the supplies at the
very end but watch out for the barnacle! Then go back to the door we
skipped and head inside.
Climb the ladder, grab the health, follow the half-assed walkway, grab
more supplies, then drop down.
You will exit into a pit of slime. Stay on the ledge, and head left.
Climb onto the pipe, cross, and grab the stuff from the corpse- he
won't need it anymore. And even if he did, we'd need it more than him
and have the guns to back it up.
Drop down off the pipe, and head to the door, staying carefully away
from the deadly slime. Continue on until the resistance people run
screaming about the enemy shelling them. Watch the shells that drop for
headcrabs, and remember to shoot for zombies' heads so the crabs don't
come loose after you kill the body.  Also, look out for environmental
traps like electricity and slime.
Continue until you come to a large metal cargo container crackling with
electricity. Remember not to touch live wires or the walls of the
container! And don't forget the supply crates inside. Run past the next
couple of headcrabs and zombies, then round the bend on the plank
docking to reach the mudskipper :)
Chapter 4
Water Hazard
Goof around for a while in the practice area and get good before you
open the gate and leave. It's a dangerous world out there. Note that to
pick up a supply crate on the mudskipper, you just have to run it over.
You will soon come to a small barn with a dock. You may notice the G-
Man up there. Land and investigate. You will find two zombies and a
headcrab, along with a few assorted supplies. Make sure to check the
attic.
Further down, you come to another of HL2's physics puzzles. This one is
simple. Just pick up the blue air barrels and drag them down under the
basket end of the ramp to lift it so that your mudskipper can leap the
gap. Check the tunnel to the left for more barrels.
The next area is not hard, just keep your mudskipper at full speed and
aim for the ramps. Dont worry about killing troops or collecting supply
boxes, just get through the area at the greatest speed possible unless
you enjoy killing everyone or collecting everything.
Soon you will come to broken overpass. Ignore the soldier atop it and
continue on until you reach a ladder. Moor there and climb the ladder.
Kill the soldier and enter the building. Watch another Breen movie, if
you like those, then move on to a garage containing two soldiers and a
few small siderooms containing a good amount of loot. Watch out for
manhacks as you approach the next room, they will swarm you if you're
not careful. They will be backed up by two more soldiers as well.
Stock up on grenades here, you'll need them as you move into this
killzone littered with sparse cover. Duck behind the Truck on right and
use your turbo, cause that turret can shred you fast. Get a grenade off
on the troop behind his cover and move through the door behind him.
You'll encounter 2-3 troops in here shouldn't be a problem to dispatch
even if you're out of grenades. Grab the ammo and move through the door
to the left, to a balcony. Shoot the exploding barrels to the right and
then duck back through the door and then out to the gun turret. Enemies
will be pouring out. Decimate them with the turret and then move
through the door behind them, back to the garage.
There will be 4-6 troops waiting for you behind soft cover with a
turret. Take out the cover and turret with grenades and then mop up
with SMG and pistol. Use the hanging shelves as traps by using
explosives near them and shooting them.
Exit via the way you came in, grab your mudskipper, and head out
through the now-destroyed water gate.
Things get more difficult now, with APC's firing rockets at you and
soldiers firing small arms. All you can really do is run away and
occasionally run someone over. Take turns sharp, juke missiles, and
look for hidden and natural ramps as well as the obvious ones.
Soon you will come up on an area with a lot of obstacles like fences
and hurled and wrecked vehicles. This took me a few tries on Difficult,
it is not easy. Once you get through, you end up at a little island in
the muck with a simple puzzle involving removing weights to obtain
life, armor, and ammo.
Continue onward to what appears to be a medium-sized Combine base. Take
a right and dock near the stairs at the door to the building. Head
inside to pick up a magnum and assorted ammo and health. Soon after
picking up the magnum the door in front of you will open, with troops
lined up like child molesters at a britney spears concert. Put those
fools out of their misery!
Move onward and then up a ladder. Watch out, there's an enemy at the
top of the stairs and a helicopter flying around up there waiting to
fill you with holes. Run between the boxes and kill an enemy, hopefully
before he releases the manhack, otherwise, deal with that before moving
onward. Manhacks are annoying. Kill another guy as you pass under a
woodern structure and head between the broken sections of chainlink
fence.
Look in the boxcar for supply crates and in a stock of normal crates
for a further third supply crate. Then enter the warehouse building.
This building contains 4-5 manhacks and 4-6 combine troops. As soon as
you go upstairs, 5-6 more will begin to enter, so be ready.
Head down the hallway then down the stairs, fighting 3-4 more troops as
you go, then look around the bottom of the stairs for supply crates,
health, and armor refills. Get ready to head outside!
Run ahead-right through the now-opened gate. Remember to get the supply
crate back around to the right as well if you missed it earlier. Avoid
the chopper and shoot the guard at the gate, then kill the guard at the
next gate as well. Head up the ladder into the guard post and grab one
of the guard post guns. Show the chopper the wrath of Gordon. Then open
the gate with the panel.
Run/swim back to your mudskipper and head around to the right, toward
the gate you just opened. Avoid the bombs the chopper drops, but
remember they are time based, not proximity, although running into one
will still set it off.
Eventually you will come to an area ramped-off to the right. Follow it
and take the big jump at the top, and you should land next to a large
warehouse. Head inside, park your mudskipper on the lift, and collect
stuff. Use the lift to drop you and your skipper into the goop heading
opposite the way you arrived, and then continue with your merry voyage.
Watch out for the falling tower! Exit the area via the tunnel.
You come out near a building with a machine and scaffolding on the
side. Another physics puzzle. Climb the ladder back in the tunnel then
drop down to get to the scaffolding. Pull the lever then weigh the
elevator down with the washer on the scaffolding above to lift the
ramp. Then leap!
Follow the waterways until you reach a gate manned by resistance
people. Enter the gate and dock. Go inside, check out the map, and
listen to the plan. Go back out and take a gander at your skipper's new
upgrade. Blow up the boxes blocking the gate, while you're at it.
You'll come out of the tunnel to a chopper's waiting rotors. It should
prove easy prety for your newly-acquired badass gun. Keep going till
you reach a gated compound. An enemy chuckle will sound and then groups
of  5 enemies will rush out on either side. Take them out with the
skipper gun then disembark to the right and head inside to restock.
Go back out, reboard your skipper, and drive up the ramps and past the
closed gate. Follow the waterways further, past a few guys on rickety
platforms, and you will get to a water tunnel with walkways on either
sides. Enemy troops will be tossing explosive barrels off of the
entrance into your path. Take them all out and move into the tunnel,
then over the drop-off.
Soon you will come to a fork. The path to the right has a troop, a
zombie, and several headcrabs, as well as some health.
The path to the left has a U-shaped area with troops rolling explosive
barrels down a ramp at you. Dodge right onto the shoulder to avoid the
flame wall and shoot the barrels as they appear. Shouldn't be too hard.
you'll empty out into the ooze again. Enter the tunnel.
As you come out, one of the two cargo crates has supply crates inside.
Go left around the beached ship and you'll come to a small dock in
front of a Combine building. Use your mudskipper cannon on the two
vehicles. There are supply crates on the beach nearby, and two more
inside a wrecked orange cargo container.
Check the cherry-red cargo contained for two explosive barrels.
Detonate them to open a path for your mudskipper under the dock.
Use the ramp to jump the gap and head into the tunnel.
You will end up in a rocky mudflats with an enemy base on one side.
Check near the beached ship and on top of a pipe as well as a few other
places for  supply crates. You will be assaulted by a chopper here, be
ready to take it out with your cannon.
Go to the smaller gate and find the little guard booth next to it with
a ladder leading up to it from the beach. Climb up and turn the wheel
until the gate is open. Go through the gate and climb the ladder next
to the dock.
Shoot the two guys that come running out of the door of the compound,
then open the door and kill the two inside. Make sure to raid the
shelves and use the refilling machines here.
Cross the compound to the stone gate, and climb the ladder down onto
it. Pull the Gate Override switch. Hop back into your skipper and head
back down to the stone gate. Get some running distance, and take that
log ramp through the gap in the gate, over the edge, into the pool
below.
Chapter 5
Black Mesa East
Enjoy the fall? Drive your skipper to the dock nearby and climb the
ladder on the dock marked with the HalfLife logo. Enter the doors
behind the building and listen to Dr. Mossman explain a few things. Follow
her to the elevator and then down to Dr. Eli Vance.
Meet Dr Eli and then Alyx will arive. After some bickering, she will
take you to your new toy, the gravity gun. After some practice picking
and throwing, she'll take you to meet Dog, her loyal pet.
But partway through the demonstration, something goes wrong. Follow
Alyx back through the elevator. The ceiling will crash in. Alyx will
instruct you to follow Dog. Do so, and then go through the door he
lifts for you.
Follow the passage until you reach a broken elevator. Destroy the lock
with any weapon to open the cage over the ladder, then climb it. At the
top, follow the passage to Ravenholm.
Chapter 6
"We don't go to Ravenholm..."
Head straight toward the water tower and enter the lit building to the
left. Note the proliferation of great missile weapons here, and the
crowd of zombies to use them on. Enjoy. Follow the passage through to
the outdoor area, where a holy man may be heard preaching. Watch out
for the whirling blade machine. As long as you crouch you're fine.
Zombies don't know how to crouch.
Enter the door to your left, kill the headcrab inside. Grab the health
if you need it, and grab a buzzsaw blade too for some slicin and dicin.
Check the dark nook in the corner for two more zombies and another
headcrab, then head out the door.
Kill the zombie at the end of the hall, then run down there and face a
room full of slowly-rising zombies and a whirly-blade machine. Destroy
them as you will, then exit and to a grotesque scene of charring
impaled corpses.
The Father will appear at a window in the building upstairs and speak
to you a bit. Grab the health pack behind the pillar and then the other
in front of the boarded door. Zombies will come through the door at
you. Kill them. Inside you'll find more health, some hurling weapons,
and a caged zombie to roast at your leisure.
Turn off the gas at the top of the hill with the valve in order to
pass. Alert the zombies to your presence, then run back and turn the
gas on. At the proper moment, hit the spark button and send them up in
flames. MWAHAHAHAHA!
Back at the funeral pyre, douse the flames using the gas valve so you
can enter the front door of the house the Father was speaking from.
Inside the house, first toss an exploding barrel up the stairs to take
out the three zombies. Then clear the blocked staircase of furniture
using the gravity gun and take out the three zombies and three
headcrabs you will encounter, including two of the new type.
Head back to the two green machines and climb the one with the vent at
the top. Enter the vent. When you leave the vent, make sure to get all
the supplies laying around, then head back to the first zombie flambe,
where we left the electrified corpse.
Climb the ladder, then the next few ladders, then jump across to the
ledge on the next building. Chat with Father Gregorian for a bit, then
drop down to the catwalk running back over the gas trap.
Jump in the window, then use the canisters as rockets with the grav gun
to take out the zombie and headcrabs below. Then drop through the floor
and walk out to the alley next door, where a car-dropping trap has been
rigged up. Use the trap a few times on the roaming zombies to get an
idea of how it works.
When the undead have been disposed of, walk out to the second car trap.
This one will also function as a lift to get you to the catwalks above.
Also, if you are comfortable making the jump, you can use the second
car lift to get high enough to jump over the fence marked with the
half-life symbol. Behind this fence is a room with health and ammo in
it.
Walk across the catwalks to the nearby window and enter. Gregorian will
comment again on your progress. Open the door and proceed down the hall
through a loading zone.
Watch out for the headcrab through the next door, then take a right and
open the door to see Gregorian bustin caps in a zombie.
Kill the zombie on the floor in the room with you, then exit through
the window and help Gregorian kill several more zombies and headcrabs
on the ledges outside. Use the exploding barrels below to clear the
area, then jump down and collect goodies while picking off stray
zombie.
Proceed to the ladder at the end of the area and climb up. Go all the
way down the planks and enter the roof to the left. Grab the loot,
watch out for the headcrab. Then double back and head into the roof on
the right. Kill the zombie on the floor and move into the next room.
Grab health if you need it, then get ready to fight a horde of zombies
downstairs. Objects around the room make good projectiles. Exit the
building via the downstairs.
Outside, quick zombies can be seen bounding from roof to roof. One of
them charges you immediately, so be ready. Search the surrounding area
for several zombies, some healthpacks, and ammo, then head into the
building full of washing machines. Kill a zombie in the hallway, then
another at the top of the stairs, then a third who, along with two
headcrabs, busts through some boards at the top of the stairs.
Pick up health and ammo in the room to the right, then up the next
flight of stairs we go. Two headcrabs wait at the very top, along with
a door leading outside. Circle around the left of the roof, and
Gregorian will talk to you a while before giving you a shotgun.
Brace yourself, because 3-4 quick zombies will now charge you from the
surrounding roofs. You can fight it out, or leap immediately into the
water vat across the way, then climb the ladder out. More quick zombies
will attack now, climbing rain spouts and leaping across large gaps.
Enter the room, gather the goodies, and two more quick zombies charge
when you hit the elevator button.
At the bottom of the elevator, you will meet the headcrab momma zombie.
Kill him and the quick zombie as well as a few headcrabs, and then
climb the board on top of the car over the fence.
Go right to a room with health, ammo, and a headcrab in it. Keep
following the alleyways until you enter a new, larger area with some
quick zombies leaping across the roofs. Take a left and watch out for
several zombies, headcrabs, and another headcrab zombie momma.
Enter the contruction area to the right, with the visible balcony
outside. Climb the stairs, pick up the health, and flip the lever on
the balcony outside. Jump down, run to the big building with all the
pipes on the top, and climb the stack of boxes on the right side. Jump
across to a ledge on the wall, climb the ladder, then follow the board
walkway from roof to roof until you reach the top of the big building.
Restock on health and supplies here then double back to the walkway,
where the platform should be in the middle, allowing you to cross. Jump
across, and prepare to be beset by lots of quick zombies and hurled
headcrabs. You can take this time to drop down behind the locked door
and unlock it from the other side, but that means climbing back up.
Doesn't seem worth it to me.
Jump to the fire escape on the opposite side, listen to Gregorian, and
get the health from the room inside the window. Pick up a buzzsaw and
head into the hall, slice zombies. Repeat as necessary. Make your war
forward as you do this and eventually you will get to the end of the
horde. Go down the