Death Stranding Half Life cross-over explained: How to find Portal cube quests for Valve-themed rewards

Where to get started with the PC-exclusive collaboration.

Death Stranding Half-Life and Portal crossover is new and exclusive for the 2020 PC release.

Hidden in the game are bonus missions themed around finding companion cubes.

Completing these rewards you with some Valve themed items - including Gordon Freeman's glasses, a wearable Headcrab from Half-Life, and a Valve, er, valve.

On this page:

If you're looking for assistance on the critical path, our Death Stranding walkthrough can help.

Death Stranding Half-Life and Portal crossover quests explained

Death Stranding's Half-Life and Portal crossover content comes in the form of bonus missions sent to your inbox throughout the game.

Keep checking your inbox, and look for messages with the iconic Half-Life Lambda symbol (λ) in the subject header. For example, the first is from Benjamin H.


Each one wants you to find one of Portal's companion cubes out in the world. The body of the email will give you directions of where to find them based on local settlements and landmarks.

Once you have found the cube, add it to your cargo stack, and return it to a base as you would any other lost cargo, completing the mission and giving you a Valve-themed reward.

There are multiple to find throughout the game - so keep checking your inbox for when new ones appear as you complete more Orders.

Tomorrow is finally in our hands! Our Death Stranding walkthrough outlines how to play through the main story, including Episode 3 missions, the Small Thermonuclear Device and how to find a way to change Lockne's mind, find a way to cross the tar belt and make a decision, and bring this to an end. As you play, you can find Memory Chip locations, unlock pre-order bonuses and have to learn how to fight BTs and Mules, how Death Stranding multiplayer works, and to help you get around easier, how to get a bike and how to unlock fast travel in Death Stranding. Finally, the PC version has exclusive Death Stranding Half-Life cross-over quests.

Death Stranding Half-Life and Portal crossover reward items

For every Half-Life and Portal quest you complete, you unlock a new Valve-themed reward.

From what we know before launch, these include...

Gordon Freeman Glasses:


Wearable Valve valve:


Wearable Half-Life Headcrab:


Half-Life logo decal (for decorating vehicles):


Half-Life Combine Strider hologram (for decorating bases):


Half-Life: Alyx gravity gloves:


If you're looking for more from the critical path, our Death Stranding walkthrough can help.

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Matthew Reynolds

Matthew Reynolds

Guides Editor

Matthew edits guides and other helpful things at When not doing that, he's out and about playing Pokémon Go or continuing to amass his amiibo collection.


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