Unused Content

In Undertale Yellow's game files, some unused content can be found left over. This article aims to document this content.

Unused Items

Homemade Cookie

Homemade Cookie (shortened as "Cookie") is an unused consumable item which restores 20 HP. Its flavor text when checked is "Info message", the default check text, but there is an unused script that check text for it reading "A little burnt on one side, but looks yummy anyway." When used in battle, it reads "You scarf down the Homemade Cookie." When used in the overworld, the game softlocks.

Golden Scarf

Golden Scarf (shortened as "G Scarf") is an unused item accessible through the game's debug menu alongside Super Ammo. It is the best accessory in the game, giving a boost of 25 DF. Its flavor text when checked is "It's emitting a violently golden shine." and when used is "You put the Golden Scarf on. Your tremendous taste for fashion makes monsters go easy on you." It sells for 100G.

Super Ammo

Super Ammo is an unused item accessible through the game's debug menu alongside Golden Scarf. Despite its check text claiming that it is supposed to increase AT by 15, more than any other ammo in the game, it does not actually increase AT at all. Its flavor text when checked is "Regular toy gun ammo sold at your favorite convenience store. Boasts a "Premium" sticker on the top of the packaging." and when used is "You load the Super Ammo. Your gun now feels lighter than your conscience." When used in battle, it uses the Rubber Ammo's attack ring interface. It sells for 100G.

Toy Knife

The Toy Knife from Undertale has weapon stats left over. Like in Undertale, it's programmed to grant 3 AT points (whereas the Toy Gun and Wild Revolver grant 0), and has its slashing attack bar left in the code. However, when used in practice, the attack bar goes unused, and instead is skipped in favor of an immediate "Inf" damage attack. This is a general failsafe used for all invalid weapon IDs.

Unused Text

Main article: Unused Text

Unused Characters

Sans

A few sprites for Sans the Skeleton from Undertale are left in the game. These include his left and up walk sprites and three dialogue portraits: regular, looking sideways, and winking. His associated talk sound, font, and strings related to his notable skull-like laser guns (Gaster Blasters) can also be found. Additionally, Sans-related content still appears in the final game, as the lake in rm_snowdin_10_yellow is known as obj_sans_lake.

While he does not appear in the final game and was never intended to, Sans was included in a playtest build of the game. He was hidden for a joke, and only a couple playtesters found him. Spasco created a Fun Value where Sans would appear in the Saloon. After Clover spoke to him, he would walk off-screen.

Mettaton

Unlike Sans, no Mettaton sprites were left in the files. However, two scripts for Mettaton talking are left over. Mettaton's talk sounds are referenced but are not actually included in the files. There are also unused strings referencing mus_mettatonbattle (Metal Crusher) and mus_mettaton_ex (Death by Glamour).

Undertale Customs Leftovers

Ms. Mettaton

An unused fight can be found for someone named Ms. Mettaton, appearing to be a leftover from Undertale Customs, which Undertale Yellow's engine is built from. Her fight will only generate with the global.game_mode variable set to Customs, rather than Yellow.

Her attacks use the Blue SOUL mode. There are also unused strings referring to "Ms. Mettaton EX", and various sprite names.

Craniex

Like Ms. Mettaton, this is most likely unused data leftover from Undertale Customs. All sprites and associated audio files have been removed, alongside most scripts, however some of Craniex's dialogue is still in the code, alongside the names of his attacks.

Unused Mechanics

SOUL modes

Data exists for the Blue, Purple, and Green SOUL modes from Undertale, and an unused variant of the Yellow SOUL, alongside unused sprites for Red and Blue SOULS. The Blue SOUL appears to be a leftover from the unused Ms. Mettaton fight, as it's referenced in her attack code. By editing an enemy's start_enemy_attacking code, it's possible to spawn the Blue SOUL, complete with three different directions; The standard 'Down' rotation crashes the game, due to an error in the control code.

Internally, Clover is considered to have the Red SOUL in most fights, but has an override in the SOUL sprite data to change the sprites to yellow. This override also applies to the Blue SOUL. The SOUL mode variable is only used by El Bailador in the final game.

obj_test_follower

An unused follower for testing, implemented very differently in comparison to the actually used followers.

It uses removed sprites named spr_rals_up, spr_rals_right, spr_rals_left, spr_rals_right; the name "rals" suggests that these sprites were of Ralsei from Deltarune. Ralsei sprites were also used in place of Clover's when testing swapping Clover's sprite out in different environments before the shader system was implemented.

Unused Attacks

Unused Bowll attack

Bowll has an unused fourth attack, "Bowll Test Song", which uses the Rhythm SOUL mode. The attack calls the same attacks El Bailador uses. As Bowll is immediately before El Bailador in the attack list, it's likely this was used to test El Bailador's attacks before the character was implemented.

Unused Flowey Phase 1 attacks

Attack mockups from the Undertale Yellow artbook showing the unused audience attack.

The 1st phase of Flowey's boss battle has a few unused attacks.

Shoebox

This attack consists of shoes dropping from a shoebox, two at a time, with a gap to move through. It is a reference to the shoebox in Toriel's house.

Audience

This attack would hide all of the battle UI except the bullet board, and show a sketch of a crowd under it. There would be a small box at the top of the board that would say "HATE" and flowers would start being thrown at Clover. There is a variant of this attack that read "Joy," however, other than a few associated graphics, this attack's data has been completely removed. It appears that plushes of the five main characters would be thrown at Clover and then land on the bottom of the board.

Unused Graphics

Unused Polygonal Flowey sprites

The sprites for the Polygonal petal phase of the Flowey battle include two unused images of himself glitching out in an erratic manner. According to developer AeroArtwork, these were intended to show up during the phase randomly and sporadically, but were scrapped because they were found too distracting.^{[citation needed]}

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Unused Ceroba Ketsukane portraits

Some unused dialogue portraits for Ceroba. It is unclear where, if anywhere, these were planned to be used.

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  A portrait of Ceroba grinning
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  A derpy face, known as spr_portrait_ceroba_wat internally.

Dina

An unused variation of Dina's design with a pink color palette. This was her original palette, but there were too many pink and purple shopkeepers, so the developers changed her to orange.

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  The unused Dina overworld sprite.
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  The unused Dina leaning sprite.

Unused Flags

Hotland Genocide flags

Hotland appears to have once been planned to be a fully fleshed out area, as opposed to only a brief visit. Leftover data for Genocide's kill area, area 5, can be found in scr_determine_world_value_yellow, although only the first room of UG Apartments is considered part of this area. The unused global.geno_complete flag for Hotland is also present in the code, set in the scr_initialize script, and can be changed in the game's SAVE data, but is never read by the game.

It's likely the expanded Hotland was cut early in development, as it lacks a large amount of required data, and doesn't have any associated kill count data.

Pacifist Route Sousborg NPC

In the Pacifist Route, after sparing Axis, a Sousborg NPC should appear in the Chemistry Lab. However, this area is inaccessible and Sousborg isn't even fought in the Pacifist route. Interestingly, Sousborg does appear in the Pacifist Route credits, suggesting that Clover was supposed to access the area and fight them at one point in development.

Unused Music Tracks

Main article: Unused Music Tracks

Unused Cutscenes

Altered Dalv farewells

Dalv has an unused variant for the exiting Dark Ruins cutscene for if he was damaged in his fight. There are two versions of this cutscene, one for the Pacifist and one for the Neutral route. This cutscene includes an unused animation of him using his lightning powers instead of breaking the boards with his hands. All of this actually worked correctly in the demo version of Undertale Yellow, and would work correctly in the final game, if not for the Dalv damaged flag never being set. Both cutscenes are viewable here.

• Well, here we are.
• I should thank you...
• For helping me out so much.
• Because of this...

Pacifist Route

• I'm leaving this place.
• I'm tired of being alone.
• It'll take a few days to pack up...
• But I think I'm ready to give the Underground another shot
• I suppose I should get you out of here but...
• Honestly, you confuse me.
• You hurt me but yet, you gave me freedom.
• Is that what real friends do?
• If so I don't know if I really want to leave.
• If everyone will hurt me then help me...
• Is that a place I want to be?
• Well... I can't let this opportunity pass.
• It's ok, I forgive you.
• You probably were scared by me...
• Most monsters are...

Dalv turns around to look at the exit door.

• ...

Dalv turns around again to face Clover.

• It seems the exit is blocked off...
• I'll deal with it.

Dalv destroys the boards with a lightning bolt.

• There we go. You're all set.
• Oh, before I forget, I never asked for your name.
• Mind informing me?

Selecting "Clover"

• Clover? What a nice name.
• Well, Clover, you should get going.
• See you later...
• Friend.

Dalv walks back to his room, and the cutscene ends.

Neutral Route

• I'm going to be friendly to everyone.
• ...
• I supposed I should get you out of here but...
• Honestly, you confuse me.
• You hurt me but yet, you opened my eyes.
• Is that what real friends do?
• I would leave but...
• If everyone outside will hurt me then help me...
• Is that a place I want to be?
• No.
• I've lived here for a long time.
• It's comfortable and I know the residents.
• The unknown is a scary place...
• I'm not ready for it...
• Not yet at least.
• The monsters here need someone to look up to.
• I could make them happy.

Dalv turns around to look at the exit door.

• ...

Dalv turns around again to face Clover.

• Well, anyway. It seems the exit is blocked off...
• I'll deal with it.

Dalv destroys the boards with a lightning bolt.

• There we go. You're all set.
• Oh, before I forget, I never asked for your name.
• Mind informing me?

Selecting "Clover"

• Clover? What a nice name.
• Well, Clover, you should get going.
• Goodbye...
• Friend.

Dalv walks back to his room, and the cutscene ends.

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  Dalv destroying the boards blocking his house's exit with a lightning bolt.

obj_cutscene

The cutscene (viewable here) initiates by interacting with a Starlo NPC. He looks up, waits 2 cutscene frames, and then looks down and says:

• [Starlo] This is really bad.
• [Starlo] I'm a fake test Starlo.
• [Starlo] But I won't leave it this way!
• [Narrator] (It doesn't have to be this way.)

Starlo walks down and Blossom begins playing.

• [Starlo] A

obj_cutscene2

The cutscene (viewable here) starts with Blossom playing and a Ceroba NPC saying:

• I'm really sorry about the pops Starlo.
• When I see them... It's like a demon takes over.

Following this, a Starlo NPC says:

• Look at it from my point of view.
• You're looking forward to some pops after a long hard work day...
• Only to come home just to see...
• Just to see...

Then, the Starlo NPC looks to the left and says:

• Argh!
• I need time...

After that, the Starlo NPC walks off-screen. Due to an error, it doesn't switch to the next part of the cutscene. Via forcing the game to skip the "Starlo walking off screen" part, you can see the rest of the cutscene. The Ceroba NPC says:

• Loool worth it.
• Those pops were delicious.

Afterwards, the Ceroba NPC looks down, Blizzard Approaching starts, and she says:

• What are YOU looking at?!

obj_cutscene3

The cutscene starts with a Starlo NPC looking down, and then walking towards the y-coordinate 40 (presumably where Clover was meant to be). Subsequently, a battle with The Shufflers starts. This is the only cutscene that is reachable without modifying the data.win file, due to it already being in the room rm_debug.

obj_test_dalv

An unused NPC that uses Dalv's sprites. It faces the left and walks to (300, 120) along the X axis, with walk speed set to 2 and animation speed set to 0.2, and avoids the player.

obj_test_martlet

An unused Martlet NPC with broken movements, presumably used to test cutscenes activated by interacting with an object. Upon interaction, it says the following dialogue (without portrait):

• Hello. This is MARTLET.
• Just kidding, I'm TESTLET. * I'm here to show you how I can walk around.
• Watch and learn, kiddo!

After arrived == 1, which appears to be impossible:

• I bet you can't walk like that, scrub.
• Testlet, out!

Changes animation to martlet_fly_away which is nonexistent. After action_sprite == 0, which again, appears to be impossible, Testlet gets removed, and the cutscene ends.

Neutral Route Hotland Rooftop Cutscene duplicate

obj_hotland_roof_cutscene_neutral_2 appears to be an old revision of obj_hotland_roof_cutscene_neutral. It only contains the LV 1-2 dialogue variant and is missing the quick-save before the fight with Meta Flowey.

References

Attribution

• This article incorporates material derived from the "Undertale Yellow" article on The Cutting Room Floor wiki and is licensed under the Creative Commons Attribution 3.0 Unported (CC-BY) License (24 June 2025).

External Links

• Undertale Yellow on The Cutting Room Floor