The fun value is a random variable in Undertale Yellow which is initialized to a value between 0 and 80 [ 1 ] when resetting a SAVE file and determines which rare events may happen in the game, similarly to Undertale 's fun values .
Compared to Undertale , Undertale Yellow has more fun events and no additional rolls for whether a fun event occurs or not, making the overall chance of finding a fun event on a regular gameplay much higher. However, unlike Undertale , Undertale Yellow does not enable all fun events in its debug mode.
When the fun value is set to 1 (chance of occurring: 1.23%), the game changes Swig 's name to "Dave." [ 2 ] This affects three occasions: Rephil calling Swig and Toast to come during their introduction in front of the Honeydew Resort , Rephil's letter to Clover after they reach the Oasis Valley , and Toast's dialogue when backtracking to Snowdin after getting the ability to Fast Travel .
This was the first fun value made for the game. [ 3 ] Unlike with other fun values, Swig's name has a 1.23% chance to change to Dave every load even if the initially generated fun value was not 1, because the game doesn't reset the name back after checking the saved fun value. [ 4 ]
When the fun value is between 2 and 10 (chance of occurring: 11.11%), [ 5 ] a man sitting on a chair [ 6 ] appears on the Wild East Saloon's stage before Starlo 's second mission. When the fun value is between 9 and 18 (chance of occurring: 12.35%), the same man appears at Honeydew Resort 's stage after defeating Martlet . [ 7 ]
Once Clover exits the room they are in, the Chair Man no longer appears. It is possible to see the Chair Man in both Wild East and Honeydew Resort when the fun value is set to 9 or 10 (chance of occurring: 2.47%). Together, these two events make the most commonly occuring fun value event in the game, with 20.99% chance for a player to see the Chair Man at least once during their gameplay.
The chair man was proposed by Figburn . Despite repeated rejections, he spent years asking MasterSwordRemix to include it in the game. They eventually implemented him as a fun value. [ 8 ]
When the fun value is between 11 and 15 (chance of occurring: 6.17%), the Box Conveyor Puzzle in the Steamworks spits out an Annoying Dog as its sixth item. [ 9 ] The dog jumps out of the machine, onto the floor below the conveyor belt, then runs away.
When the fun value is between 16 and 19 (chance of occurring: 4.94%), [ 10 ] the security station in Steamworks (which Clover ends up in when Axis catches them during his chase in the Neutral or Pacifist Route ) displays a face grinning on the display. The face resembles ICE-E from Undertale and Deltarune . When interacting with the TV, the face appears to scream, and the TV turns off. This occurrence may be a nod to the iconic jumpscares from the Five Nights at Freddy's series, or a reference to a recurring joke in Deltarune , where Noelle has a childhood fear of the ICE-E's P"e"zza mascot.
When the fun value is between 20 and 29, the designs on the four pillars in the Pillar Room may change depending on its value. For each of these events, the chance of occurring is 3.7%; however, the first three events may occur at the same time (when the value is 22, with a chance of 1.23%).
These four drawings appear to depict the Snowdin Attack and the events that followed, as described by the Videotape : Dalv running after being attacked, Axis sent after Integrity, Integrity after being attacked by Axis, and finally the human's obtained SOUL.
When the fun value is between 30 and 39, [ 15 ] Clover gets transported to a secret area after returning from the area where Ice Pellets are found in the Snowdin forest. Chance of occurring for both of these events is 6.17%, making them together one of the most commonly occurring events in the game, surpassed only by the Flowey fight dialogue (which has additional requirements to it) and the Chair Man.
When the fun value is between 40 and 45 (chance of occurring: 7.41%), a duck appears during Clover's boat travel between Snowdin and Hotland . [ 18 ]
When the fun value is between 51 and 55 (chance of occurring: 6.17%), a door appears in the North Mines , [ 19 ] in the second room after the fall into Dunes . The door leads to a room with Gerson from Undertale . If the Genocide Route has been completed in Snowdin, the door appears, but Gerson does not.
When returning to the Estate 's basement on a Pacifist Route after separating from Martlet, with the fun value between 60 and 62 (chance of occurring: 3.7%), [ 20 ] the static turns into a video of Chujin with distorted sounds in the background before turning back to static. In the noises that play is a heavily modified version of the "I miss you" sound from Smiles and Tears , the credits song from EarthBound . [ 21 ] In version v1.0 of the game's full release, this Fun Event could happen when visiting with Martlet for the first time, but this was patched in v1.1. [ 22 ]
When the fun value is between 63 and 64 (chance of occurring: 2.47%), an additional Wanted sign displays on the Wild East news board. [ 23 ] By opening the image in an image editor and heavily increasing the contrast, the poster is revealed to contain a simple line drawing of the Everyman from Undertale and Deltarune .
When the fun value is between 65 and 69 (chance of occurring: 6.17%), [ 24 ] a character named Mr. Sir appears behind the broken game machine in Café Dune . The character is colored in shades of gray and speaks to an unknown entity on the phone. When Clover interacts with them, they claim Clover is jeopardizing the operation and tries to distract them by asking them about school.
When the fun value is above 70 (chance of occurring: 13.58%), [ 25 ] and Clover has fought him at least three times before (the changes happen on the fourth fight and beyond), Flowey's dialogue at the end of his Neutral Route fight changes. He expresses doubt that Clover and him are alone in his mind. This might imply that Flowey might be feeling the player 's presence. This event is the second most common fun event, albeit its prerequisite makes it appear much rarely on a regular gameplay.
Flowey says the following dialogue: [ 26 ] [ 27 ]
Please add content by editing the page. Reason: Needs: 1. Images for each fun event 2. Modification like we have on the Undertale Wiki (this might be blocked by the existence of a Technical:SAVE article) 3. Possible elaboration on "the path" in Jane Doe's section