Portal 2 Rat Man Dens

Scattered in the early chapters of Portal 2, which you might miss if you’re burning through puzzles using our Portal 2 walkthru, are hidden rooms you can reach if you look carefully, which are always covered in scribblings and drawings. They often appear to be the rantings of a mad man, one with an unhealthy interest in Chell.

In truth, these rooms are the “Rat Man dens” — the living spaces of a test subject called Doug Rattmann, a former Aperture Laboratories employee forced to run the portal tests before Chell in the first Portal. When you see “the cake is a lie” scrawled on the wall — that’s the handiwork of Doug “Rat Man” Rattmann. He’s also a paranoid schizophrenic who is off his meds while locked in the Enrichment Center by GLaDOS.

You can get Rat Man’s story in the “Lab Rat” comic created by Valve, which bridges the story between Portal and Portal 2.

There are also six of Rat Man’s rooms you can discover while moving through Chapters 1-3 of Portal 2. We’ve got the locations listed below — finding one of them is the means to unlocking the “Final Transmission” Achievement or Trophy, as well.

There’s also a highly specific kind of Easter Egg you can find in the Rat Man dens, called the Rat Man Transmissions. Follow the link to see how to unlock them.

Den 1

Location: Test Chamber 4, Chapter 1

You’ll reach this first Rat Man den automatically when you fall through a glass surface as part of the story.

Den 2

Location: Test Chamber 3, Chapter 2

Includes: Easter Egg “Exile Villify” by The National

When you get to the Discouragement Redirection Cube (the weighted storage cube with the lenses used for redirecting lasers), look across to the wall opposite your position. You should see a hole in the wall that you can slip through. Here you’ll also find a radio playing the song “Exile Villify” by The National. The group actually wrote the song just for Portal 2, and you can listen to it in its entirety in the room.

Den 3

Location: Test Chamber 6, Chapter 2

Includes: “Final Transmission” Achievement/Trophy

To get to this Rat Man den, you’ll have to carefully position some portals and launch yourself using an aerial faith plate (one of those catapult things). The den is accessible through a vent that’s easy to miss. Get there by starting at the door to the chamber and looking for two angled panels on the right side of the room. Put a portal on the higher, right-most panel, then one on the wall to the left, where the white portal-accepting panels stretch out on the bottom a little further than they do on the top. When you go through the portals using the faith plate, this will shoot you into a vent in the corner to the right of the angled panels.

To unlock the “Final Transmission” Achievement or Trophy, hit the button on the weighted storage cube tube at the end of the level and let it dump out all its garbage. Look for a radio amongst it and bring the radio with you. Approach Rat Man’s drawings inside to unlock the achievement when you hear a coded transmission. You can decode it with the steps we’ve got on our Rat Man Transmissions page.

Den 4

Location: Chamber 12, Chapter 3

Includes: Pretty drawings

This one is accessible through portals, but you’ll need to use the Hard Light Bridge in order to see it. Look at the ceiling for a hole — that’s where you’re headed, among the ducts hidden behind the panels. In order to get there, get up on the Hard Light Bridge through normal means, then look up in through the hole in the ceiling. You should see a portal-accepting surface on the ceiling. Nail it with a portal and jump through to come out in a small room with another mural.

Den 5

Location: Chamber 16, Chapter 3

Includes: Mural showing GLaDOS turning on the Aperture scientists, Band of Turrets Easter egg

This chamber is filled with turrets, and the very first thing you’ll do as you enter the room is pass a turret behind a grille. You can only dodge it at the moment. Solve the puzzle as you usually would, using the laser beam and portals to kill the three turrets nearby and get the cubes. Using the storage cube to hold down the button and portals to redirect the beam, hold the cube with the lens in it to fire the laser at the turret behind the grate to blow it open. Go inside and you’ll see the Band of Turrets Easter egg, and find the den just beyond.

Den 6

Location: Chamber 17, Chapter 3

Includes: A reference to Chell and the Lab Ratcomic

Standing on the Hard Light Bridge near where it comes out from the wall, above the archway leading toward the exit. There’s a portal-accepting surface above that, so shoot it with a portal to send the bridge up there, as far left as you can. Then walk through the portal and stay on the bridge, and you should come across an open panel on your right. Sneak inside to find the last den, another mural and a bunch of interesting mugs scattered everywhere.

There’s more hidden junk scattered throughout Portal 2 — get all the info you need with our Cheats page! Unlock a few accouterments for Atlas and P-Body with our Steam Content FAQ for the PC version and reshape the game to your will by accessing our Developer’s Console Explanation. Hit up our ever-growing library of Achievement Explanation Videos and Trophy Walkthru Videos. Plus, there’s more hidden Easter Eggs than you can shake a robotic wood-like branch beam at.

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22 Comments on Portal 2 Rat Man Dens


On April 24, 2011 at 12:20 pm

The last den has more to it. You can put a portal through the bottom fan, which leads to a random hallway. Also, if you stand close to the wall with the art, you can hear something that sounds like whimpering.


On April 24, 2011 at 3:21 pm

You missed one, in Chapter 2, chamber 16

Use the reflective cube to take out the lone trapped Turret near the entrance, it blows a panel off and you get some good stuff, more art and a little song :)

Phil Hornshaw

On April 24, 2011 at 6:54 pm

@Stu — that’s Den 5, in Chapter 3.


On April 25, 2011 at 2:20 am

There are SEVEN in total. You are missing the den from Chapter 3, Room 11. It is behind a section of the wall at then end of the light bridge (where you place your first portal) that pushes out when you get the cube.

Phil Hornshaw

On April 25, 2011 at 2:42 am


You’re right, I just stumbled on that den today — it’s a smaller one that contains a lot less in the department of Easter eggs than the other,s but it’s definitely still there. Updating the post accordingly; thanks for the catch.


On April 27, 2011 at 5:40 am

Also there is a den if you go up through the stairs in a level that tells you to disregard any undesirable complements about your performance. that was i think chapter 1 chamber 4 or 5. I don’t remember properly but i think it was in a passage between 2 rooms.


On April 27, 2011 at 5:53 am

I found it. it is just after the disregard undesirable complements message.


On May 2, 2011 at 5:36 am

In the small den that bob mentions, you can hear tapping if you stand close to the light on one of the walls. Maybe it’s Morse? Even if not, presumably it’s meant to be someone tapping a pipe or something similar to let you know they’re there.


On May 4, 2011 at 9:06 pm

whats with the disk on the floor in the ratmans den capter 2 test 6


On May 18, 2011 at 9:55 pm

If you have designer commentary on, the last den has a commentary bubble that sounds like weird feedback and dial-up noises. It’s very strange, and prevented me from hearing the “whimpering”

Shuttle Tydirium

On May 20, 2011 at 6:25 pm

What I thought was interesting was one of the cups in Testchamber 17 read “#1 Dad” Rattman? A Dad? TO WHOM!?

Personally, I think Gordon Freeman from Half-Life (obviously) and Allyx (Also from Half-Life) might have had a child. Chell maybe?

But I’m more then curios as to who Doug Rattman actually is and what role he plays in Portal (Besides the comic Valve released) and Half-Life.


On June 17, 2011 at 3:42 pm

if you go to den 6 (chap 3, chamber 17) in debeloper commentary mode, you can find a commentary node with a bunch of morse code.

i cant find anything about this anywhere, am i the first to find this?


On September 5, 2011 at 5:47 pm

the noise you hear can be decoded on the computer versions of the game or if you hook your game system to your computer, there is a software for noise decoding. it eventually shows you a picture of a companion cube on the moon. there are videos to this


On September 19, 2011 at 5:51 pm

So there are actually 8 dens, not 6. Bob and Abddbz have posted above and I personally found both the extra dens based on their directions:

“Also there is a den if you go up through the stairs in a level that tells you to disregard any undesirable complements about your performance. that was i think chapter 1 chamber 4 or 5. I don’t remember properly but i think it was in a passage between 2 rooms”.

“Chapter 3, Room 11. It is behind a section of the wall at then end of the light bridge (where you place your first portal) that pushes out when you get the cube”.

Also I haven’t tried: “The last den has more to it. You can put a portal through the bottom fan, which leads to a random hallway”.


On September 24, 2011 at 3:34 pm

Hey anyone notice that in Den 4 there’s a mug that says #1 dad?? I’m not a great suppoerter of the ratman-is-chell’s-father theory but this could be evidence!


On September 24, 2011 at 3:37 pm

just realized someone already commented lol thought i’d been first


On February 3, 2012 at 1:43 pm

I just want to say about some cool stuff I found at the end of the game.You know the at the part were GlaDos is talking to you and she say’s [killing you is hard]well she’s sending you to the surface so the combine will kill her instead plus in her song she say’s “you want your freedom take it that’s what im counting on”well she means she’s counting on you going to the the surface an stumbling acros the combine and geting kill’d by them also in the first game she say’s “when I look out ther im GlaD im not you” because she think’s you’ve escaped. that has nothing to do with this at all sorry lol.


On February 10, 2012 at 2:01 pm

exil vilify wooooooootwoooooot


On February 10, 2012 at 2:04 pm

no one is here….hello……pleas…….some one say somthing


On February 10, 2012 at 2:19 pm

uhhh so enyway hey eny on see that orang cat that rattmann did.Like oggy……my cat.Oh yeah I you know that fina transmisson thing well it has mors code right well if you hook it up with a computer and a sound program it shows the companion cube on the moon.BUT I THOUGHT THAT CHELL HAD IT ?strang


On February 10, 2012 at 2:29 pm

also when a radio gets incirated when play’d back words it sound extremly like [ELI IS STILL ALIVE].I love valve


On February 10, 2012 at 2:33 pm

uh did I leave it to long beause I just notest no one has said eny thing in over a year