Half-Life: Opposing Force Part 18 Walkthrough

Q: Half-Life: Opposing Force how to avoid rocket damage?

Navigate the rocket firing chamber, avoid rocket damage, and descend into a pit. Find the .357 Magnum near toxic spills, then use pipes and valves to progress. Avoid damage from a collapsing pipe and collect tripmines. Optionally skip the Gargantuan fight using tripmines or defeat it and its allies with careful tactics.

Q: Half-Life: Opposing Force where to find .357 Magnum?

Navigate the rocket firing chamber, avoid rocket damage, and descend into a pit. Find the .357 Magnum near toxic spills, then use pipes and valves to progress. Avoid damage from a collapsing pipe and collect tripmines. Optionally skip the Gargantuan fight using tripmines or defeat it and its allies with careful tactics.

Q: Half-Life: Opposing Force how to use valve wheel?

Navigate the rocket firing chamber, avoid rocket damage, and descend into a pit. Find the .357 Magnum near toxic spills, then use pipes and valves to progress. Avoid damage from a collapsing pipe and collect tripmines. Optionally skip the Gargantuan fight using tripmines or defeat it and its allies with careful tactics.

Q: Half-Life: Opposing Force how to avoid pipe damage?

Navigate the rocket firing chamber, avoid rocket damage, and descend into a pit. Find the .357 Magnum near toxic spills, then use pipes and valves to progress. Avoid damage from a collapsing pipe and collect tripmines. Optionally skip the Gargantuan fight using tripmines or defeat it and its allies with careful tactics.

Q: Half-Life: Opposing Force how to skip gargantua fight?

Navigate the rocket firing chamber, avoid rocket damage, and descend into a pit. Find the .357 Magnum near toxic spills, then use pipes and valves to progress. Avoid damage from a collapsing pipe and collect tripmines. Optionally skip the Gargantuan fight using tripmines or defeat it and its allies with careful tactics.

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Walkthrough

1
After the initial sequence, hit the red "TEST FIRE" button and hide in a corner to avoid rocket damage.
2
Retrieve the pistol dropped by a guard near the explosives room.
3
Descend the ladders in the rocket firing chamber to the bottom floor, then find and climb down the ladder in the center pit.
4
Quicksave, then carefully crouch-walk along the sloped ground until you reach section c1a4g.
5
After a minor drop, make a major drop into a pool of water. Aim for the center to avoid instant death.
6
Exit the water and approach the green toxic spill area to find a .357 Magnum and ammo. Find another ammo box on the opposite side of the pool.
7
Look down into the pool to see two holes. Dive in and go through the right hole.
8
Move forward and up to emerge on a platform with a ladder. Use the nearby health and HEV stations if needed.
9
Get onto the large brown pipe to the left of the platform and follow it.
10
Drop onto lower pipes, move along them, turn right, and drop to a lower pipe.
11
Run along this pipe until you can jump to a larger pipe with a gap, a valve wheel, and an open hatch.
12
Use the valve wheel to close the pipe gap.
13
Crouch-drop onto the ladder near the open hatch and climb down to avoid health loss.
14
Jump over the large hole in the pipe segment, then crouch-walk through a small fencing hole.
15
Continue down the pipe until section c1a4j loads.
16
In section c1a4j, turn the last corner to a large discolored pipe segment. Walk onto it to break and slide down. Lean on the "Move backward" key to reduce fall damage.
17
If you don't land on the table, jump onto it to crush the headcrab, get .357 ammo, and potentially health.
18
Bash crates to find health packs and five unset tripmines.
19
Move down the corridor past the room to reach the start of the "Power Up" chapter.
20
Section c2a1: Gargantuan Problem
21
Optional Skip (Non-Source Version): Run into the gargantuan's chamber, then through the large opening on the right. If you reach the concrete barricade fast enough, the gargantua won't follow. Use two laser tripmines to create a path over the barricade. Set the first tripmine on the middle of the three lower concrete sections, jump on it, move right, set the second tripmine on the upper middle section, and use it to jump over.
22
Standard Progression: Enter the chamber where a gargantua fights two marines. Run to the doorway directly across from your entry point.
23
As soon as you're through that doorway, equip the shotgun and look down the hallway to the right.
24
Shoot an explosive barrel when a vortigaunt appears to kill it.
25
Pass the vort's side hallway and continue down the main one.
26
Reach a broken floor with a pipe shooting flames. Quicksave.
27
Move past the pipe to where a vortigaunt sees you, then back up quickly around the corner. The vort should kill itself on the flames. If not, quickrestore and try again.
28
After flaming the first vort, quicksave and repeat the process for the second vortigaunt.
29
Crouch-walk to the floor hole the pipe is sticking out of. Use the pistol to kill the four headcrabs on the floor below, watching out for the pipe's flame.
30
Around the corner past the pipe, go up to the railing and shoot the two…

Tips

Hiding in a corner near the "TEST FIRE" button is crucial to avoid rocket damage.
The drop into the pool of water requires precise aiming to avoid instant death.
Using the "Move backward" key while sliding down the collapsing pipe can mitigate fall damage.
Tripmines are very useful for both bypassing the Gargantuan encounter and for general combat.
Exploiting environmental hazards like flames and explosive barrels can make combat encounters easier.

.357 Magnum
.357 Magnum Ammo
Health Packs
HEV Station access
First Aid Stations access
Five unset Tripmines

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