Half-Life: Opposing Force Walkthrough Missing in Action

September 12, 2016 (Last Updated: ) | Reading Time: 5 minutes

This Half-Life: Opposing Force walkthrough is divided into 12 total pages.

You can jump to nearby pages of the game using the links above.

Missing in Action

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 85
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 85

Go towards the end of the narrow path.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 86
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 86

Crouch under here to get in.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 87
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 87

Get through the vents but beware that some of the tiles can break and you will drop down a place with electrified water.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 88
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 88

If you drop down here you will have to get back up to the vents again.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 89
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 89

At the end of the small vents you will reach two big fans. Walk over the small paths to reach the other side.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 90
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 90

Jump to the other fan from here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 91
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 91

You might have to take some damage when you pass through the steam.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 92
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 92

Go down here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 93
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 93

Jump down the hole that is under the broken fan. You will have to do it fast because even with one propeller the fan is still deadly.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 94
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 94

Cross this section when you wait for the flames to pass.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 95
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 95

Enter a vent.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 96
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 96

Another set of flames to cross.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 97
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 97

Proceed through the pipe.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 98
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 98

Go towards the box with red sign.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 99
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 99

Push the box with the danger sign forward.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 100
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 100

You need to push the explosives box in the place beyound the striped line.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 101
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 101

Press the test fire button that is near you to set off a chain explosion.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 102
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 102

Go down the hole that was created by the explosion.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 103
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 103

Fight off some aliens as you go down the cave.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 104
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 104

Follow the pipes that go down.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 105
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 105

Enter the vent.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 106
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 106

Get down on the road.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 107
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 107

The dying soldier will give you some info.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 108
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 108

Go to your left from here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 109
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 109

Go past the crates and prepare to fight a new type of alien.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 110
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 110

This alien is fast and will rush you down but you can avoid it by going back as it tries to attack. It can shoot spikes as a ranged attack as well.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 111
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 111

Go up the stairs to the service elevator.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 112
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 112

Look outside the elevator shaft.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 113
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 113

Jump to the ladder.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 114
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 114

Go down the elevator shaft and enter the elevator.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 115
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 115

You can climb up the elevator vent here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 116
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 116

Jump from the elevator to the fallen door here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 117
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 117

Go through here and try to avoid the cable at the center.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 118
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 118

Jump up the crates here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 119
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 119

Go to your right and enter the place with grates.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 120
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 120

Cut the power from this switch.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 121
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 121

Get back to the elevator shaft and jump on the cable to climb up.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 122
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 122

Jump on top of the elevator. Try to swing from the rope so the jump is easier.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 123
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 123

Go down the corridor.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 124
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 124

Push the small box under the vent to get inside it.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 125
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 125

Exit through the destroyed wall.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 126
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 126

Get back to the corridor where you left the small box.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 127
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 127

Push the box near the barricaded corridor to jump to the other side.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 128
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 128

Pick up a grenade from here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 129
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 129

Use the grenade to throw it at the explosive box.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 130
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 130

The explosion will create a big hole in the wall.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 131
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 131

Push the small box yet again. This time through the hole you just created.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 132
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 132

Push the box under the next vent and enter.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 133
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 133

Go through the office.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 134
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 134

Jump down here.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 135
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 135

Pull the lever.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 136
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 136

Use the nearby radio.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 137
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 137

A few soldiers will crash through the maintenance access.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 138
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 138

Get the engineer soldier to follow you to the door that is nearby. He will open it with his blow-torch.

Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 139
Half-Life: Opposing Force Walkthrough - Half Life-Opposing-Force 139

You can order both soldiers to follow you in the elevator. You can use the extra firepower.

More Half-Life: Opposing Force Walkthroughs

This Half-Life: Opposing Force walkthrough is divided into 12 total pages.

More From Port Forward

Thumbnail for Phantasy Star Online 2: New Genesis

How to Port Forward in Your Router for Phantasy Star Online 2: New Genesis

Help improve your connects in Phantasy Star Online 2: New Genesis by forwarding some ports in your router.

Read More
Thumbnail for Darkest Dungeon

Forward Ports on Your Router for Darkest Dungeon

You can help improve your online multiplayer connections in Darkest Dungeon by forwarding some ports in your router.

Read More
Thumbnail for For Honor

For Honor Port Forwarding

Help improve your online connections and make connecting with others easier in For Honor by forwarding some ports.

Read More
Thumbnail for Chicory: A Colorful Tale

Forwarding Ports for Chicory: A Colorful Tale on Your Router.

You can forward some ports in your router to help improve online connections for Chicory: A Colorful Tale.

Read More
Thumbnail for Wave Break

Create a Port Forward for Wave Break in your Router

Forwarding some ports for Wave Break can make it easier to play with others and help improve your connections.

Read More
Thumbnail for Knockout City

Forwarding Ports for Knockout City on Your Router.

Help improve your online connections in Knockout City and connect with more players by forwarding some ports.

Read More
Thumbnail for Dying Light 2: Stay Human

Port Forwarding for Dying Light 2: Stay Human

You can connect with friends more easily and help improve connections in Dying Light 2: Stay Human by forwarding some ports.

Read More
Thumbnail for Far Cry 6

Creating a Port Forward in Your Router for Far Cry 6

You can help improve your online experiences and more easily connect with others in Far Cry 6 by forwarding some ports.

Read More