Undertale secret rooms 

Undertale doesn't need any creepypastas. Those are all built in already.

Time to wake up and smell the p a i n

That 1:31 room with the red "creatures" milling about.... is that the only room where NPCs walk shuffle around? I can't think of any other place where non-event NPCs move idly like that.

1:50 I like how the entire universe is unfolding behind her and Undyne is just staring at you like, "What are you looking at?"

This game ranges from funny to sad to scary to pissing you off to the nth degree. I think you can literally say this game gives you a lot of emotions.

4:57 belive it or not, that is actually Toby Fox's origanal design for the candy room.

“La la la!~ Time to wake up and SMELL the p a i n.” big mood

1:06 * [Redacted] That’s what it says... this one is pretty mysterious because ‘Redacted’ means censored for legal or security purposes.

4:22 So, someone was on that conveyor belt earlier and shouted "Error!" while they were passing by the echo flower?

1:53 Undyne saw all her life passing through her eyes

2:58 I love how Alphys looks like she's talking.

7:58 I feel bad for this dude since most people don't hack into these rooms, his dialogue actually kinda makes sense

I would be terrified if I found some of these

holy fuck. Slowing down the video in the Spritecheck made me see something... Chara has seperate animations for walking... Just walking animations. The scariest part? No eyes...

3:13 Please dont---------- These huge sprite sheets o-------- Just 'cause mo-------- Things here AR----------- Anyone else noticed it?

Why are all of these rooms like lowkey creepy? Am I the only one who thinks that?

1:55 When you die and your life passes before your eyes

Toby asked us not to do this...

I personally find room water redacted the creepiest

2:24. Okay, I haven't seen this video in a while. I always assumed this sprite was like, Chara or something before dying or the genocide route. But now that I look at it again, this is Toby Fox's first Kris! (Look very closely or slow it down, it is only a few frames)

In the Undertale kickstarter, if they exceeded the $45,000 goal, a comic plus another game would be in the works. Toby already said he is working on the script. He also said: "The "other" game... I can't tell you anything about it. *Its very nature is shrouded in darkness.* Ha ha ha." Dark, Darker, Yet Darker ...

1:37 I read on the Undertale wiki that the Temmie's had unused walking sprites in the game files, maybe this room was a test for their AI to alk around the village?

"you took a piece of candy. Boy, that's heavy." Chara, being a snarky sarcastic adorkable child since 201x.

3:12 sad you can't see the full picture, but the message clearly show that this room was intentionnaly left there, so people could find it.

1:50 when undyne's face is just there

How to find gaster in the Sprite room go to 2:23 stop the video at the Right time done

1:51 The ultimate Undertale speedrun.

0:43 Spamton NEO fight has this line in Deltarune!

I really like Gaster's voice mumble. Don't know why.

In the Spritecheck,I saw Mettaton's Fabulous Legs.

7:04 I'm convinced what was meant to happen for the cutscene in this original version is that the wood would've been like a bridge platform that you pass under, but undyne is facing away, and as you're beneath it the scene triggers so she doesn't really know you're there, and it would've been why papyrus fled the scene, as he was basically told to murder a friend right in front of their face. I assume it was later changed because with undyne literally closer to you than papyrus it would've been hard to justify you not hearing her speak to him, but decided they wanted her dialog to him to be ambiguous so they changed the area up.

0:00 - 0:40 "ENTRY NUMBER SEVENTEEN (17) DARK DARKER YET DARKER THE DARKNESS KEEPS GROWING THE SHADOWS CUTTING DEEPER PHOTON READINGS NEGATIVE THIS NEXT EXPERIMENT SEEMS VERY VERY INTERESTING WHAT DO YOU TWO THINK (?)"

I love the sprite room because you can just sit back and let your subconscious absorb literally everything in Undertale

In an audio track, not sure which one but you need to dig deep, if you slow it down by 400% then at the 5:00 mark you can hear somebody say "Hello World!" It's a relatively deep voice but it's enthusiastic and quiet. I think it's Gaster.

HOLY CRAP so im pausing in the debug menu area and im currently on a melting undyne sprite *WASNT PLANNING ON SLEEPIN ANYWAYS*

5:38 From the sound, it seems like the mushrooms you could cause to start/stop glowing were originally planed to be campfires.

You can translate the Wing Dings text. ENTRY NUMBER SEVENTEEN DARK DARKER YET DARKER THE DARKNESS KEEPS GROWING THE SHADOWS CUTTING DEEPER PHOTON READINGS NEGATIVE THE NEXT EXPERIMENT SEEMS VERY VERY INTERESTING ... WHAT DO YOU TWO THINK?

HOLY FUCK HOW DEEP DOES THE RABBIT HOLE GO

1:36 if you look closely those red thinghs are like the black thinghs geting out of the holes on the walls on the beggining of deltarune

room_spritecheck quickly cycles through all the sprites WAIT A MINUTE I SWEAR I SAW KRIS

1:50 haha little undyne head

Am I the only one who kinda wished that every secret room had a Gaster Easter egg?

In room_water_readcted 1:02 the song playing in the background is "Premonition." This song possibly relates to a lot of things so I'll number them out. Also, the thing what the sprite says is *[redacted] 1. The only other time Premonition plays in Undertale is when you talk to Sans about echo flowers at Grillby's 2. Premonition is a leitmotif "Before the Story" from Deltarune Chapter 1 ost, which only plays on the menu screen after beating the game at least once 3. Before the Story also has the leitmotif "Once Upon A Time" in it from Undertale ost, which plays during the introduction sequence of Undertale when you launch the game I don't know what this all means together but I'm sure some of you theorists out there could form something out of this info.

1:00 its demo room when you quit demo and restart with gaster name

P.S. If you want to get to the Gaster room without doing extra work to not corrupt your save files, room 264 does the same thing

1:44 NEO Froggit attack :P

1:45 Ice Sign “Icicles fall” *[Easy]*

0:04 is it just me or does this part sound like someone screaming

Year 3303 It's been a millennium and a half since I started climbing down the Undertale rabbit hole. I've resorted to just falling and waiting for the end. I think I'm nearing the edge of the universe... no wait, I passed that back in 3266... WHERE THE FUCK AM I IN THIS RABBIT HOLE JESUS FUCK.

Fun fact!: This is a fun fact!

Gaster’s room has to be the creepiest.

Undyne: I could feel all their hearts beating as one... What Undyne felt: 1:55

Joystick config isnt secret, you just need a controller

I noticed Sans eating ice cream in the sprite check.

fun fact: joyconfig can be found when you insert a controller your computer recognizes as an xbox controller, undertale will see it is inserted and you can configure settings to map buttons to keys. yes, you can use programs to make your computer recognize a dualshock 3 or 4 be recognized as an xb controller

2:23 Do Anyone See Gaster?

room2 I believe has to be the scariest. You see the three froggits disappear in a sea of red. Also, Gaster always speaks with the asset abc_123_a.ogg. Check that out.

the spritecheck got me tripping ALL of the balls

I love Gaster and how much of a mystery he is but damn does he give me such unnecessary anxiety.

I fear no man but That thing (GASTER) It scares me

guys, after looking around in the games code after the most recent patch, on line 4487 in the script, I found the name Gaster in there. What's strange is, these lines are the inputs for boss names/enemy names, you'll find things like "Asriel Dreemur" and more here. Unless this is leftover text, did I just confirm an unused Gaster battle? *EDIT* after looking around some more I just realized, that is the last line of text for that section..

For those wondering, all it says at 1:06 is: * [redacted]

The undertale comic series "Dogs of futute past" is making a whole lot more sense now

*bullettest* MOM! I THINK I BROKE THE GAME AGAIN!

_"All these echo flowers saying ERROR!! Though... In this hell... Who would say Error to an Echo Flower?"_

2:59 Alphys with eyes turned into hearts - relatable :D

In a way, the test rooms that aren’t old versions of rooms replaced in newer builds of the game feel like little pieces of Gaster. You know, outside of time and space? Edit: As I’ve become more engrossed in how Toby has handled Deltarune, this idea has become more and more of something that I can believe. God knows what Gaster has done to shatter across worlds, let alone take others with him…

3:12 I saw the picture from the end of the soulless pacifist ending O.O

1:06 those windings meant this * [redacted]

Some of these rooms remind me of Yume Nikki just for the surealnes of them...

1:03 This room feels... mysterious. But not in a creepy way. It’s mostly the music

0:00 room_gaster 0:39 room2 0:41 TESTROOM 1:02 room_water_redacted 1:15 room_water13 1:31 room_overworld 1:43 bullettest 1:50 room_spritecheck 3:14 room_joyconfig 3:26 room_controltest 3:44 room_fire4 4:02 room_fire10_old and room_fire10A_old 4:31 room_tundra_placeholder 4:56 room_ruins_12B_old 5:13 room_tundra_rollsnow 5:36 room_water7_older 6:11 room_meetundyne_old 7:49 room_water_mushroom 8:41 room_monsteralign_test Like so others can see

Anyone else see all the Gaster sprites at 2:23?

Gaster: **makes L-O-L sound** Me: Haha lol.

1:05 It Says: * [redacted] You Can Translate It By Yourself.

7:50 thats a freaking gaster follower

1:57 The one after nabstapblook, the dog in armor with a spear... I don't remember him being in the game

1:06 Gaster says: *[redacted]

Fun fact: the joycon config is no longer a hidden room

3:12 Don’t upload these huge sprite sheets online,

1:59 Undyne melting due to excess determination EVEN THOUGH she's not wearing her Undying armor 2:31 Full body Grillby sprite OMG I love this

3:13 "Please don't... These huge sprite sheets d... Just 'cause mo... things here ar..."

1:51 Undyne is just staring into our soul

6:13 Papyrus is just in disbelief

2:17 well....

that spriteroom creeps me

1:55 this REALLY shows how many sprites there REALLY are

Nobody: Toby: let me insert disturbingmusic.mp4

6:51 PAPYRUS YOUR BEING SCARY STOP IT UNDYNES NOT THERE

6:42 Papyrus and the music actually scared me LOL

1:50 Undyne is the center of the undertale universe

6:30 Was supposed to say "(This sign is written in very neat cursive.) "Do not destroy the science grass." "It is used for science." Edit: destroy not touch

hello hhheheh have some respect and don't spoil the game it's impossible to have mysteries nowadays because of nosy people like you please keep this all of this between us i f y o u p o s t i t o n l i n e , i w o n ' t m a k e a n y m o r e s e c r e t s n o o n e w i l l b e i m p r e s s e d i t w i l l b e y o u r f a a a u u u l t

"Please... Please come back..." 2:18

2:24 idk why but i remembered kris

I love how during the spritecheck room Undyne’s face is just kinda there

someone should make a undertale creator, a program that lets you build custom levels/rooms mabye even with custom enemies/bosses

I dunno why, but the creepiest ones for me were the Spritecheck room and the room_overworld ones freaked me out the most... I think the overworld one creeped me out because it was the Game Over music...

Fun game: Pause during the sprite room. Whatever you got is now you. Who or what are you? . . . I'm Mettaton EX.

REDACTED has so much of a better chance of being related to Gaster, but I guess you can't do much interesting stuff with that sprite so everyone goes to MysteryMan.