This will be a series of hints/directions to help you progress in the EotE DLC. It's recommended to start this DLC after you have finished the base game and continue to play on the same save instead of starting a new one.
Do not skip lines or read further than what you need to, this is a series of hints and I tried to keep it as spoiler-free as possible. Also, avoid using this when you get stuck for just a bit. Try to figure out the puzzle, or go explore another place, and solve a different puzzle. I only advise using this guide only when you have been hard-stuck for hours and have no other places to explore.

1. Hmm, seems like a new museum exhibit has been opened, you should probably check it out.

2. The satellite captured quite a strange image, maybe there is some information about that capture that you should remember.

3. The station is called Deep Space Radio, maybe an equipment of yours can make use of that?

4. Perhaps the person who appears in one of the images captured by the Deep Space Satellite can tell you how to reach it.

5. The information I told you about earlier, do you think you can make use of that at the satellite?

6. The trailer for the DLC can offer you a hint on how to start the DLC.

1. The door is locked behind a pole with a weird green orb thing. Strange. The place is quite dark, perhaps there is something you can turn on to help you navigate better in the dark.

Wow, you made it, good job, you... What a massive place this thing is. It's easy to get lost here. Please only use this part of the guide after you have completed a full 22-minute loop and got stuck.

2. There seems to be some kind of projector in one of the houses, maybe you can use it with a new kind of item you found.

• In real life, an old school projector will cast light into a roll of film to project an image onto the large screen, maybe you can use that information and apply it to the game.
  
  
• What would be the perfect light source for the projector? It has to fit within the projector machine for sure, otherwise, how can you see the image clearly?

3. So you think you have explored all of it already, but perhaps you could have missed:

• Some places became inaccessible once the dam broke out and flooded The Stranger. But it also means that a submerged structure that was hidden beneath the water is showing up now that the water level has lowered.
  
  
• Are you sure you have watched all the slide reels in the Cinder Isles? Some of them contain pretty crucial information about the tall Island Tower that sits atop the place.
  - The Island Tower is pretty tall, but you can only access the first floor?
  
  
• A place tucked in a little corner that easily be missed. Look around, I think you can spot it with a keen eye.
  
  
• There seems to be a broken bridge regardless if the dam is broken or not, maybe there is another way to access it? Perhaps from the other side?
  
  
• Right by the dam there is a lone house with a closed door. There is a pretty useless locked "gate" right by that you can just jump through. The house looks pretty broken, I think you can find a way around it to get inside.
  
  
• A slide reel shows an explosion on the outside of The Stranger. That might be worth exploring. Location: There is a door in the Hidden Gorge that will not open.

Originally posted by Feldspar:

When all in doubt, ship log it out.

The Ship log is your friend. Revisiting some slide reels can also be useful, it's easy to miss out on information because you get overwhelmed by the place.

Before you reach this section, make sure you have explored everything if you are following this guide and don't want to get spoiled. The only places that should either be unexplored or not fully explored are:

• The House with a locked door behind a planet/moon/star code interface on the Reservoir
  
• The abandoned temple by a broken bridge
  
• The Island Tower on The Cinder Isles

In order to reach the second part of the DLC, you must know a very crucial piece of information. This information can be found easily through the many slide reels scattered around the ship.

In case you somehow completely miss it:

First, make sure you know what to do with the Artifact before reading on - if you don't, review the previous section point by point.

• In order to enter the "Dream World", you must doze off at a green fire while holding an artifact.
  
• The most accessible place to get the artifact early game is the house covered in Ghost Matter in the River Lowlands. The second one that is useful for mid-game is located on the table inside the Damaged Laboratory, which can be accessed through a breach outside of the ship.
  
• There are four locations in which you find a green fire.
  - Three of them are hidden behind a false panel in the house with multiple paintings and lanterns. Locate the painting that has a moon that looks like Saturn, remove all the lanterns around it until it's pitch black and the false panel will be opened.
  - Another one of them is in the Submerged Structure.

This next section can also be quite scary and annoying, with lots of wandering in the dark, and backtracking,.. You can select the reduce fright option in the game setting to make it less spooky.

So because of that the next part will be a bit more straightforward walk-through to help you get it done quicker if you feel uncomfortable playing it (I still advise you play this section without any help if you can even if it means it's scary, since that is the whole point of the DLC)

So you entered this new area. Everything is dark and scary. Let's explore!

The Subterranean Lake

• This place can be entered through the Submerged Structure.
  
  
• It seems like the area down there is surrounded by water, better be careful, you don't want to fall down there and shut the fire out of your lantern.
  
  
• There are three interfaces, each of them leading to an area with a weird structure with a red fire inside of it.
  
  
• A locked vault? I wonder what is inside? Maybe try taking a peak?

The Starlit Cove

• This place can be accessed through the Cinder Isles' Island Tower.
  
  
• There seems to be a dock on your left that is accessible. Maybe you can "light" up a way to it
  
  
• Did you check the Subterranean Lake area yet? The information you found there can be quite useful.
  
  
• An info you found earlier points toward the Island Tower in the Cinder Isles.
  "The light coming out of the vault gave me a vision of climbing a spiral staircase to a room near the top of a tower. One of the Stranger's inhabitants pointed at a mural of the tower beneath a nighttime sky, then picked up an artifact and left the room. Sometime later, the lamps next to the all went dark, revealing a secret passage."
  Maybe there is a connection between the Dream and the normal world. After all, the tower is still there in the Dream World.
  
  
• Hmm, all of those passcodes for the sealed symbols are burnt. So opening the sealed vault in the Subterranean lake is a lost cause. There are only two codes remaining. The symbol looks quite familiar, however. What places beside the lake also have interface locks? (Hint: not the dream world)
  
  
• There is not much else we can do here at the moment, let's revisit this place later.

Revisit: The Abandoned Temple

• How to get there: In case you haven't figured out how to get there (the house with a broken bridge regardless if the dam is broken or not), you can find another way to get to it by going to the Hidden Gorge and enter the cave with Ghost Matter in it)
  
  
• It should be pretty much straight forward what to do next here. Use the information you learned earlier to progress. In case you haven't figured it out and just want an answer:
  - You can find two interface codes in the Cinder Isles' Island Tower.
  - First, extinguish the candle in the same Island Tower but in Starlit Cove. ( Light up the bridge first to gain access to Dream World's Island Tower)
  - Then return to the normal world, use the secret cave entrance right underneath the tower( it might be underwater depending if the dam has broken off or not and enter the room) The false panel should now be opened and you can find the codes down there.

The Three Secret Locations

• The First Projection: Follow the picture, it's in the River Lowland. It's hidden behind a tree. In a place that looks like a giant sewer grate
  
  
• The Second Projection: A lake on the right side of Cinder Isles. Hug the right side of the river while rafting there and boost your way up the cliff
  
  
• The Third Projection: In the Hidden Gorge. Get the elevator to go down, don't get inside it. Then jump slowly through the elevator hole until you see an opening

The Shrouded Woodlands

• This place can be accessed through The River Lowlands.
  
  
• This place is like a swamp, yipey.
  
  
• The locked door seems to be facing a certain "structure" similar to the one you see in the Subterranean Lake, maybe you can use that structure to open the door?
  
  
• That locked door opened to what appears to be a dock, you should probably keep that in mind.
  
  
• There is a house across the water with music coming out of it. But how can you get there? Maybe try following the locals, they might know the way (Be careful, I don't think all of them are hospitable)
  
  
• The house is guarded heavily!! You can't seem to pass through. Maybe it's best to just leave for now and wait for them to begone and get back there?
  
  
• You managed to enter the house but don't know where to go? Maybe there is a slide reel that shows you the way.
  
  
• Solution: Jump through the fire
  
  
• After that reaching The Forbidden Archive in this place is pretty much straightforward.

The Endless Canyon

• Use the knowledge you learned earlier from Map Projection 3 and get down to the bottom floor
  
  
• Be careful, when the lights are out, all the doors that were locked before are now open. And thus came the Owl People. I counted at least 4 of them.
  
  
• Getting past those Owl People is a real pain, huh? And all to activate a single bridge... Maybe there's something else you can use to get to that side instead of the bridge?
  
  
• So you got to the bottom floor and saw the door open, on the side of a cliff is a cave. But how do you enter it? Perhaps you already know how and even make use of it to be able to get here in the first place!

Return to the Starlit Cove.

• Use the knowledge you learned earlier from Map Projection 2 and to get down the well.
  
  
• Be careful, like Endless Canyon, once all the lights are out, they come out. Once you are down the well, there are large rooms with 3 of them. Don't go straight because there is a hole in the floor and you will fall down
  
  
• Tip: Perhaps the info you have learned at the Forbidden Archive of Endless Canyon can be useful here!

• How to deal with the one whose shall not be named:
  -Is the Owl/Elk People giving you some trouble? Try focusing the light on them.
  
  
  And with that, you have finished the mid-game and all that is left is to reach the end. So close!
  

So by now, you should have all the information needed for the ending of the DLC (unless I'm missing something, in that case, my apologies!)

Now return to the Subterranean Lake, not through the submerged structure but rather by the method you learned at the archive earlier on.

• The second seal (the raft) should be straightforward and simple.
  
  
• The first seal (Right side of the raft when looking straight to the sealed vault). It looks like there is no way across. The knowledge you learned earlier at the forbidden archive can be quite useful here, so be sure to check the ship log again if you are stuck
  - Hint : Maybe try putting down the artifact?
  - Solution: Put down the artifact and walk past its range, then you can see the bridge.
  
  
• The third and final seal: Uh oh it's the bell thing again, you can't just shut out the light this time. I wonder if something you learned earlier at one of the Forbidden Archives can be useful.
  - Hint 1: Is dozing off the only way to enter the dream?
  - Hint 2: Yes you have to enter the dream world through death, not sleeping
  - Hint 3: The solution is in the same room with the green fire ;;)
  - Solution: Jump to the fire

And with that, you have reached the end of EotE. It should be straightforward there
After you see you and the Prisoner leaving on the raft, there is nothing else to do other than jump off to the water or do anything to disconnect from the matrix world and end the loop. That's the end of the DLC. The only thing left now is to bring your new friend into the creation of a new universe (AKA redo the true base game ending).

This is the end of the guide, thanks for reading. If there is part of the guide that is missing, is too vague, has bad grammar or If you are stuck please leave a comment down below. You can also join the Outer Wilds unofficial Discord. There are many people there who will offer you spoiler spoiler-free solutions.

I want to personally thank the people at Mobius Digital for making this game and the DLC. Now that the DLC is over I will probably not gonna be able to play anymore out of this game except for 100% or just get in there and chill. It has truly been an amazing experience that I for sure will not forget until the day I die (or maybe I will be able to find a way to forget about it and replay the game again, who knows!)

Special thanks to the following people:

• Mini Marshmellow and the Outer Wilds Unofficial Discord Community for helping me get past one part of the game when I got stuck
  
• Iris Fulgur for the suggestions and changes to the Mid Game Sections 1 and 2
  
• Maxistviews for the suggestions and changes to the Mid Game (Section 2) - Before you read and Mid Game (Section 1)
  
• Koon for the suggestions and changes to the End Game section