Half-Life Part 47: Destroy Ray Gun and Escape

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Walkthrough

1
Destroy the large door ahead of the tank. This will cause alien grunts and vortigaunts to teleport in.
2
Strategy 1: Get on the side of the tank above its ladder, quicksave. Fire the cannon, then immediately back up against the nearby wall. Turn right, run along the wall to the walkway's ladder, and climb it quickly. Run past the stairs in the previous room and wait. Crouch-walk back to the repair bay's entrance and use the sneaky hornet strategy against the aliens. If grunts fire hornets, retreat past the stairs and wait before returning. (Vorts can't zap you through the walkway.)
3
Strategy 2 (Alternative): Crouch behind the tank's open hatch. Fire the cannon, then look left and use the machine gun without changing position. Watch for vorts and grunts to your left.
4
Strategy 3 (Alternative 2): Back up to the floor behind the tank, avoiding grunts. If a vort sees you, wait with the assault rifle. Move against the wall and jump-fire hornets over the tank until the two alien grunts and any vorts are dead. Check behind red tool cabinets for missed vorts.
5
After clearing the aliens, proceed toward the door you blasted. Stay on the right side of the passage, crouch-walk forward, and look left to spot the ray gun. Use regular hornets to destroy the gun and the two grunts behind it. (Destroy the ray gun before horneting the grunts.)
6
Switch to the crossbow. Slowly crouch-strafe to a position where you can see the ray gun but it cannot target you. Shoot it with darts until it is destroyed.
7
Deal with the final alien grunt to the right using the crossbow.
8
Run toward the destroyed ray gun; a wall will collapse.
9
Before exiting, find one health pack and two armor batteries.
10
Return to the repair bay, climb the walkway ladder, and go to the bottom of the stairs. Move forward and left to a large yellow machine. Bash the wooden crate for a health pack. Find an armor battery at the back of the narrow passage to the right of the machine. (Note: The source text contradicts itself on the existence of this armor battery.)
11
To find the other armor battery, return to the toxic waste spill near the elevator. Crouch-walk along the safe path to another large yellow machine. Jump over toxic waste to the machine's right side, then crouch-walk onto its narrow rim. Cross to the machine's left side for the armor battery, then return to the right side. Jump back over the toxic waste and return to the safe area.
12
Go back to the repair bay, pass the ray gun emplacement, and find a large door with a button panel to its left. Use the panel to open the door.
13
Go through the door and use the big yellow button on the left wall. The "Lambda Core" chapter will begin.

LAMBDA CORE - Section c3a2e: BIG LIFT AND ASSASSIN ROOM

Go through the big doorway and up steps on the right. Enter the small control booth and use its button.
Run to the big lift platform with the truck. Stay towards the back right as it descends.
When the lift stops, use the hornet gun's altfire to shove aside a small wooden crate to kill a headcrab. (Note: The crate may need to be destroyed with altfire hornets if it won't move.)
Use the crossbow to sneak-shoot a bullsquid spitting at a headcrab on crates.
After the bullsquid is dead, use the hornet gun to kill the three headcrabs on top of the crates. Look behind the nearest stack of green crates for one last headcrab.
Alternative (from lift): Hornet-kill the three crate-top headcrabs and any floor-level headcrabs within range. Kill the bullsquid with the assault rifle or shotgun if it appears, otherwise use the crossbow. Look for more floor-level headcrabs.
Use the crowbar to bash all wooden crates for supplies.
Use the yellow ladder to climb up to a first aid station, shotgun shells, and hand grenades.

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