Portal 2's Most Broken Glitch 

"hey everyone, cave Johnson here. just wanted to let you know about something. DO. NOT. MAKE. CHAMBERS. WITH. MOVING. PORTALS. For some reason, the physics when it comes to going inside of a moving portal is extremely broken. Our scientists are still scratching their noggins about why this thing keeps on happening. If you ever see one of these, just let that anomaly of a wormhole alone and live a lot longer."

10:02 "You shoot a portal and you win" He literally explained the entirety of Portal series within one sentence

nobody's talking about the fact that you can see p-body in the single player?? like i knew he showed up at the end but the fact that he shows up as a little easter egg is super cool to me

1:13 this is probally the only sponsor throughout all the galaxies that takes more than 1 nanosecond to figure out its a sponsor its really hidden

I’m going to do a moving portals propulsion catch one AND NOBODY CAN STOP ME!

It's simple, the cube inherits the speed of the portal.

My brain: let's try making a map out of this :)

i think that b. would be correct cause smash down onto something random palm flat above a floor, gets momentum right? fast momentum yeah? now pretend theirs a portal on your hand and a portal anywhere! or just put you hands around a pencil shove em down and see "hey my pencil goes up fast!"

this video changed my life

there's something really delightful about how this glitch is mostly only useful in post-wheatley-takeover chambers. it's as if he's so terrible at managing the facility, the very laws of the game break down

interesting. i didnt know moving portals were only a console command away. id always thought that moving surfaces were unable to support portals because their physics change every frame or something.

I find it so endearing how so many speedrun categories have rules that are put in place because the glitch/skip "isn't fun"

it's not that the feature is incomplete or broken, its the fact that the physics around portals is simply bugged. you cannot have ropes through portals for instance. in portal 1 they do the security cameras in a very clever way; when it passes the portal, the cable is despawned and respawned afterwards. or teleported. prop_portal always been buggy, especially in portal 2. that's why the paradox attempt didnt work, it might've worked if the cube was placed perfectly center in the portal, at best. in addition to that, certain surfaces may make portals respawn when transitioning between static and moving. pretty great video as always through. kudos

I facepalmed incredibly hard when you explained that all you have to do is go to the main menu. As a programmer myself, it's such an understandable oversight, but so obvious once realized

Since the moon is always orbiting the earth, doesn’t that make the end of portal 2 a moving portal?

Msushi is almost verified, crazy progress, feels like yesterday when he was just 16k

0:30 Ah yes, the chamber that I couldn't complete because I thought no moving portals was an actual game mechanic. I still feel betrayed.

Klooger said: “you shoot a portal and you win?” Yeah that’s the point of the game

This is quite a moving Portal video!

This is the real answer to the moving portal problem, obviously. As the portal approaches the cube, the cube is immediately shot backwards out of the way just before the portal contacts the ground

"That sign can't stop me, because I can't read!" Portals - 2011

I do really love how Wheatley just smashes two tests together and they always seem to have a solution.

someone should make a mod to make moving portals actually work when you go through them

I think the speed boost is because of the velocity of the player, and since it reached over a certain number, it sets the velocity to around 15 (ish) launching you (it’s used in the cave Johnson level)

Preserving mobile portals is a certified source moment

Oh my god I can’t believe there are Displates in Portal 2! Thank you Msushi this is life changing! I will be sure to use your link in the description for 34-42% off

I'd be curious to hear about what approximation the game is doing such that the moving portals break in that _particular_ way. Why is kicking you back the particular thing that they do?

Simple If you can see the other side, it acts like a simple doorway to a simple room, which may or may not be moving. If you cannot see through to the other side, you simply materialize with the same velocity as the portal you went through.

I always thought that at some point glados says that you can't put portals on moving surfaces, and neurotoxin level confused me so much

I genuinely hate the moving portal puzzle in Portal 2. It is established throughout the series that you cannot place a portal on a moving surface, time and time again. It is a fundamental part of the game's universe and mechanics. Then, all of a sudden, you're stuck on this one puzzle for 20-minutes because you know for a fact that it is physically impossible to place a portal on a moving surface. Then, after what feels like forever, you finally think... surely not. In a last-ditch effort, you shoot a portal onto the moving wall, knowing it cannot work. And yet it does. Violating the previously established rules of the universe. Total bullshit.

The moving portals in the neurotoxin chamber REALLY bug me, they didnt even come up with some lore explanation.

In the “portal paradox” the answer is B (in an ideal world where portals aren’t limited by the game’s programming). If you think about the from the cube’s perspective, the portal moving towards the cube at a constant velocity is exactly the same as the cube moving towards the portal. We already know that momentum is conserved between stationary portals (“speedy thing goes in, speedy thing comes out”) so the same should be true of moving portals as well. And from the cube’s perspective, it had 0 momentum both before and after, but the entire world just dropped out from under it at the same speed as the portal was moving. Think of it like stepping out of a moving train, but the train door is just the portals. From the perspective of the people on the train, you had no velocity before you stepped off, and no horizontal velocity after you stepped off, at least until you hit the ground. From the perspective of someone on the ground, you had the same velocity as the train both before and after you stepped off. From your own perspective, you had no velocity, and the entire world except for the train is moving around you. EDIT: Now that I've thought about it a bit more, I will admit that it is a lot more complex than I initially suggested. If we say the blue portal is moving down and the orange portal is stationary (relative to the room), then from the perspective of someone looking through the blue portal, the entire universe is moving towards the cube, and then suddenly stops when the portal hits the platform. From the perspective of the someone looking through the orange portal, the entire universe (including the cube) is moving towards the portal and then suddenly stops. So now it depends on which end of the portal is moving relative to the universe, and because all movement is relative according to Einstein, that question is impossible to answer. Since objects can't accelerate or decelerate without some force acting on them, I think the best explanation is that, while a portal that was created while it was moving does not cause any problems, having a portal accelerate or decelerate relative to the other is what causes the paradox. Because acceleration requires force, accelerating one end of a portal would require the same amount of force as accelerating the entire universe (which is a lot). So if you shot the blue portal before the top platform started moving, then you just wouldn't be able to move it. And if you shot it while the platform was moving, then the portal would crush the platform beneath it and tunnel through the Earth until it came out the other side and continued into space forever. Slightly unrelated, but this also made me question whether forces can be applied through portals. Like, if I placed a portal on the ceiling and then another one on the wall, and stood next to the one on the wall, would I fall through it due to the gravity from the other portal. If no, then that means the other fundamental forces (electromagnetism, and the weak and strong nuclear forces) shouldn't apply either, so walking through a portal will basically cause all the atoms in your body to fall apart.

I'm team B in the crushing portal paradox. Since all movement is relative, the speed of the orange portal approaching the cube can be seen as the speed of the cube approaching the portal, from the portal perspective. then the cube is ejected through the blue portal at the same speed the orange is crushing the cube.

8:18 hey it's the triple laser test chamber guy

The portal parodox doesn't take into account that when the portal comes down, more of the object will appear on the other side because of the fact that the portal is further down on the object. It wouldn't inherit the momentum of the object because it's not moving, even if it appears on the other end of the portal rapidly. There is no kinetic energy to transfer as the portal is technically not a physical object, however it will fall out of the other end of the portal due to gravity's effect on the box pulling it out and downwards from the sloped portal that it comes out from.

This is actually my least favorite part of portal 2. I hate when stories break their own rules just once to do a cool thing with no explanation. It's not a cool thing. It's a cop-out

Although Msushi's videos are extremely serious and all, it makes my day whenever he uploads. Thanks a lot, Msushi!

Nice work on the sponsor Integration!

I found a glitch for portal 2!!!! I always wondered about it and tried it and it saves about 4 seconds of time it’s very easy to preform I’ll make a video about it soon

i’m ashamed to admit that the displate ad was very effective on me.

helo

omg the ad 😂

I can't count the number of times I've played through Portal 2 and never considered this discrepancy

That is by far the best sponsorship segue I've ever seen. Watch out, Linus.

"Since the debut of Portal, nearly 15 years ago." WHAT THE FUCK?!

10:02 "You shoot a portal and you win" no shit

I see the time machine worked for you guys as well

MovingPortal% WR soon??

Amazing and well made content, just like every other video! Keep it up!

*displate as part in video starts* me: uugghhh again... another displate sponsor on another channel... *continues watching it* me:.... sigh..... Hol up... what is that... IS THAT.... A C E L E S T E P L U S H ? *starts over reacting extremely* (I love Celeste it's such a good game)

I'm fairly certain someone did something similar to the portal paradox by successfully crushing themselves after placing a portal underneath themselves and one on a moving platform above them, and the result was some trippy visuals that only the source engine could make

i assume the glitch is similar to that of a re portal, in game it might have been program that when a portal is moved, it could be the equivalent of closing one portal and opening a new one. i dont know im not an expert and just my take on this weird mechanic

The neurotoxin puzzle actually took me awhile because I was looking for a way to *stop* the panels. I remembered every time in P1 I'd place a portal on a moveable panel, it'd just fizzle out.

0:53 its only a paradox when you dont understand how gravinertia works. That example doesnt show the exact angle of the portal. But it would probably just roll our the blue side distance depending on the speed of moving portal

I don’t think the portal paradox is much of a paradox cause of relative velocities; The blocks velocity can’t change relative to the portals so the velocity of the cube would have to be added to the moving portal, both for entering or exiting the moving portal. If the portal is moving towards the block at 2kph the block would have to leave the other portal at 2kph, which makes sense since if you look through the stationary portal it would look like a block is coming at you at 2kph so that wouldn’t change after going through the portal.

I think I figured out the moving portal paradox thing or whatever... So basically... due to momentum, and the fact that on the other side of the portal, the cube would have a sort of visual "movement" due to the force of it going through the portal, as momentum would lead its weight through said portal... but due to weight and gravity as well, it wouldn't fling that far... yes ,you may think "but isn't the cube staying still?" Yes, but not fully, as its basically transferring the momentum of the moving portal to the movement of the cube on the other end of said portal due to momentum. Basically, momentum at first would be too weak to move the cube, but once the cube is halfway through the moving portal, momentum/force would be stronger than the remaining weight of the cube on one side of the portal, causing the cube to slightly hop/fling from the rest of the momentum. FYI, the momentum is coming from the moving atoms and such from the cube coming out of the exit end of the portal. Correct me with I'm wrong, give pointers, but I think I see this as my own solution to it...

The game specifies that the portal gun is quantum tunneling multiple times and therefore the portals can't move because if they move they will be destroyed so sadly no portal paradox but there's still some cool glitches atleast!

awesome day to be an msushi fan

Wait P-body appears in that level? Didn't noticed that and it took me like 20 minutes to beat that level

The block would just plop out of the other side because inertia is a property of matter moving through space, not two holes in space itself moving in relation to each other. I will have a fist fight with anyone that disagrees with me.

1:00 It's B. The relative velocity of the cube and exit portal must match the relative velocity of the cube and entry portal. This is what "Speedy thing goes in, speedy thing comes out" really means. To best visualize this, imagine you're standing halfway through the portal. You look left, you're looking out the orange portal. You look right, you're looking out the blue portal. You look left, and you see everything, including the cube, rushing toward you. As the cube enters the portal, you see it rush past you from left to right, and keep flying away from you in an arc. From your perspective, its velocity is constant. If you still don't get it, imagine what's going on when the cube is 99% of the way through the portal. The 1% of the mass that hasn't entered the portal is being pushed into the portal at the speed the orange portal is moving down. This in turn is pushing on the 99% of the mass that has already passed through the portal, so that 99% of the mass must be coming out of the blue portal at that same speed. Since the blue portal is stationary, the part of the cube that has passed through the portal must be moving at that speed relative to the room. The cube will not suddenly lose all that speed relative to the room as soon as the last 1% of it passes through the portal, it would violate Newton's first law. Of course, all of this is assuming moving portals actually work as they should. And in fact, there is a situation in-game where Wheatley and Chell both pass through a moving portal. It's the moon portal, at the end of the game. The moon's orbital velocity is about 1 km/s, so (even disregarding Earth's spin) the portals are moving at 1 km/s relative to each other. That means Wheatley's velocity relative to Earth increased by 1 km/s when he went through it.

If you think A should happen with portals then you think portals do not obey the theory of relativity. If you think B should then you do think they obey relativity

Until the neurotoxin level, I was under the impression that the lack of moving portals was a game limitation

Huh, my portal 2 diddnt have that neurotoxin level, are you sure this wasn’t portal 1 I’m confused af

Displate: Not only are they great decorations but they make for good improvised weapons in a pinch!

Wait. Why does p-body go into an elevator room in the first place and not a deassembly-machine-thingy?

This is what happens when valve forgets that 3rd line of code😂

What a fucking segue into the ad read! That was excellent!

I love that last line!

"you shoot a portal and you win" Damn guys, guess this game aint fun anymore

Nah I just got RU-vid premium don’t make me get ads again 😅

I've NEVER known that Pbody was in the SP campaign.... wow.

I love these videos so much. I get excited everytime I see a new one posted. A part of me prays that the next video will be about Celeste.

Idea: the portal surface in the neurotoxin room is made of a different substance than the rest of the portal surfaces that move, maybe it’s the same material that was used before cave bought the moon rocks.

It’s a good day to be a spidda fan

I think moving portal paradox will just yeet a cube, since cube technically not being stationary. Velocity is relative and only acceleration is absolute, so we can't just say that cube is stationary, because relative to different reference view (for example a car passing by, or a portal itself), so it make sense if we count a portal as the point of reference since this is only logical option

Does Displate sponsored bit. Mentions gaming posters on Displate. Does not mention any of the Portal ones.

The portal paradox is only a paradox if you're dumb. A portal is literally just a doorway except the exit and entrances are in two different locations. So of course if you move a doorway around an object, the object will not randomly gain momentum for no reason.

the Portal Paradox at 0:52 seems to have a really obvious solution to me. instead of a wall with a portal if a wall with a hole in it falls on the companion cube and the cube goes through the hole it doesn't fly out the other end the wall passes it and it's just on the other end because it didn't move the wall did and I think it would be the exact same with a portal instead of a hole. How I imagine it the companion cube wouldn't plop out or fly out once the falling orange portal makes contact with the floor the cube would be fully on the other side of the blue portal and with no momentum it would slid down the diagonal wall shown at 0:52.

Someone should make a mod that has puzzles surrounding moving portal glitches. There's probably heaps of potential for crazy puzzles that require quick thinking and complex thinking to beat them. It'd be so cool.

I think it might literally be impossible to beat this time. Here's the problem:

Lol they fucking banned it? "Be fast, but not that fast"

What happens if you connect 2 moving portals?

another great speedrunning video, I would expect nothing else

there's something really delightful about how this glitch is mostly only useful in post-wheatley-takeover chambers. it's as if he's so terrible at managing the facility, the very laws of the game break down

(10:02) - Woah, what? Klooger is using Light Mode only to hurt his vision a lot? I never expected that to happen in the image.

1:08 this is the best displate ad - possibly the best youtube ad period - i've ever seen.

I'm always happy when an Msushi video comes out.

Man the music you use. It’s like I always know what it’s from. Fez, baba is you, snakebird if I remember correctly, and now quantum conundrum. I love it

I HEAR THAT QUANTUM CONUNDRUM MUSIC!!

yeet

10:02 -statements dreamed up by the utterly deranged

0:50 Never really understood the confusion here. I might be missing something but to me (A) just seems obvious. I think the mistake people make is simply measuring the relative speed of the cube to the portals, as oppose to the actual kinetic energy of the cube itself. The cube won't gain energy as it moves through the orange portal, so it can't shoot out of the blue portal. We know this because objects entering a portal always maintain their speed. So a cube entering a portal at 0m/s will stay at 0m/s, even if the portal is moving. Because our best explanation for Portal's portals is wormholes. Which are just two points of connected space-time. So walking through a portal should be no different than walking through a door. And you don't suddenly gain speed when walking into your kitchen...

7:42 there's a P-body there?!

I’m almost 100% positive you can figure out the portal paradox using math but I don’t feel like learning new math stuff and figuring out how to logically right it down.

The answer to the portal paradox is that it depends on the velocity of the moving portal that is crushing the cube. For instance, if it is going fast, then the cube will come out fast, and vice versa.

nice.

Its (A). Simple as. If the portal is the object moving then why would the cube start moving? To pass through the portal? But its only moving relative to the portals. It is stationary. Think about it like this. If a stationary object that is not moving through flys through the other portal, then should Chel come to a complete stop because she was at an accelerated speed when she entered the portal? No, she flys through the air. Likewise, the cube isnt moving, so what would be propeling it? The portal? Which one? Is it magnetic influence or gravitational from the portal? If I hold a pencil in place and move it through a ring does it move? No it stays there and the ring moves and the pencil comes out the other end, still stationary. How is this a paradox? wat?

8:59 Pause and look at the face on the door lol

Tunneler: well atleast i have an mechanic to allow moving portals and... *You can pass through them without any problems.*