So yeah, Undertale. Like many others, I followed the pattern of A. I'm not sure about this game B. I guess I'll try it out, and then C. OMG THIS IS ART. I mean cmon, I got this layout going, and it's in the wonderful font we all know as comic sans. A game that put comic sans in my layout... that's determination if I ever saw it. Now the story is pretty out-front. You do different actions for different results and eventually you have the whole lore of Undertale in the palm of your hands... or do you?

If you've been following up on Undertale fandom... umm, the good part of it that actually involves the game and not fanfics and... skeleton porn??? The internet knows no bounds... Anywho the part that actually involves the game, you might find out that some people found secrets by manipulating the code of the game. Yeah, Toby Fox, maker of Undertale and prophet of kickstarter, even thought of THAT. He can remember when you reset the game to your last save, he can cause the game to remember past files and even make it crash itself on occasion, and he even set up scenarios for altering the game files. One in particular is the "Dirty Hacker" ending, where if you edit the file to put you at an ending, instead good ol sans shows up with a pre-recorded message, saying you shouldn't be at the ending cause of an unexpected error, and says it's actually probably because you're a dirty hacker, and the message ends telling you to leave. Pretty nice touch huh? But there are other things... primarily involving a number setting for "fun values". Changing these FV's will cause different events to occur, and some are rather neat, but among all the combinations are a few sinister misfits... let me tell you about W.D. Gaster.

Now if you HAVEN'T looked up info on stuff like this, you must be wondering who W.D. Gaster is, as he is never mentioned by anybody in the main game. Well that is sort of the point, and even then there are actually a few references to the mysterious Gaster without editing the fun values. To begin this mysterious string of occurrences, it is worth noting how anybody can check the files of Undertale and see the music files for various jingles, sound effects, and songs in Undertale. However there are five music tracks that don't play in the game but are still found in the files? The first is called "the song that might play when you fight sans". This one actually was going to be the boss theme of sans at the end of the Genocide run, but was replaced by Megalovania and still left in the files as an easter egg. The next four are bunched together, as st happytown, st meatfactory, st troubledingle, and st him. Now three of them are short, lasting only a few seconds, but st him is different. Playing him will bring up an ominous 17 second theme, pretty creepy, but who exactly is him? Many believe it to be Gaster's theme.

"BUT GEEZ, WHO IS GASTER ANYWAYS AND WHAT DOES HE DO WITH ANYTHING!?" Well that's where the values come in, and everything falls into place. Now I don't know the specific FV numbers and I'm too lazy to get them, so I'll just talk about these Gaster events. First up are the ones that directly talk about Gaster, called gaster followers in the sprite files. These are grey monsters that resemble other npc's or are unlike any other. First is the "ficus licker". You can find the regular monster in the MTT Hotel all the way to the left of the restaurant, saying he forgot a reservation, and to make it seem like he knows what he's doing he licks the dew off of a ficus plant. Well a gray version can appear after inputting a certain combination of FV's. You'll find him next to one of the left elevators in Hotland, and he tells you something never mentioned before. He says that before Alphys, the royal scientist was a brilliant man called W.D. Gaster. He was the one who created the core. He goes on saying Gaster fell into one of his creations and died, and wonders if Alphys will end up the same way. The second follower is similar to the man who is terrified after buying a donut from Muffet's baking sale, except he's gray, by the right elevator, and he has a face on his hand that he talks from in rhymes. He talks about Gaster being the amazing former royal scientist, but says he disappeared without trace, and was scattered across time and space. He then says he's holding a piece of him, and vanishes. The third follower isn't like any other sprite, and seems very poorly made, and also appears by a left elevator. He says the same praise about Gaster, but then says after an experiment went wrong he perished. He stops talking, and talking to him again will make him say he shouldn't be gossiping on people who are listening. There is another gray npc that can be put in the game through FV's. He looks like that monster kid who idolizes Undyne, with slight differences, and will say it would be scary to imagine a world just like ours where people don't exist, yet it functions perfectly without them. He will tell you to forget about him.

Now there are three more figures speculated to be Gaster himself. Two involve a figure speaking in the wingdings font (written language of the Narnians), one appearing in a stable that doesn't usually appear by the snail races run by Napstablook, and one in a dark room. It is believed that the W.D. in W.D. Gaster stand for wingdings, and this is the font Gaster speaks in, similarily to Papyrus in the Papyrus font, and sans in the Comic Sans font. Wingdings is made up of symbols rather than letters or numbers. The figure will say * x in the stable and REDACTED in the dark room. Leaving the dark room shows a sound test, showing the tracks, Meat Factory, Happy Town, and Troubled Dingle, which cannot be played. However, the track Him is here, can be played, and is labelled Gasters Theme. Finally the room where you find another figure everyone believes to be Gaster can be accessed through fun values and upon speaking to this figure he looks surprised and disappears.

And it still doesn't stop there either, if you put the name Gaster as the name of your character, the game resets, forcing you to pick another name, much like when you name your character one of the main characters. Finally, another FV can start the game up with another passage in the wingdings font, which translates to
"ENTRY NUMBER SEVENTEEN
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?"
The only place you find entries like this is the true lab, and there isn't an entry 17 in there. But here's where the conspiracies begin...

If you go north from Snowdin, you might get a wrong number from a person and receive the wrong number song. The person was trying to contact a person whose name began with G... and that riverman/woman says random clues and hints, like how to find Temmie Village, but she occasionally tells you to watch out for the man who speaks in hands, and the man from another world. This is similar to the Gaster follower who had a head on his hand, and wingdings has a few hand symbols in it. Also, aside from W.D. possibly meaning wingdings, the name Gaster may also reference the Aster font. So we can definitely assume that Gaster has a font reference in his name... much like Papyrus and sans... but do they connect somehow? YES THEY DO ACTUALLY.

For one, the wrong number song might show up as Papyrus' caller ID, and if it does reference Gaster, then that means maybe Papyrus is connected. However more prominently is sans, who is PROVEN IN GAME WITHOUT ANY CODE CHANGES to be connected with Gaster!!!

If you reached an ending where you didn't kill Papyrus, in the hallway where sans appears to talk to you about your actions and LV and EXP, if you finish the conversation and reset the save, sans will repeat the beginning of the speech and then stop, saying you seem like you've heard this before. He says you always seem to know what is going to happen, and he suspects you might be a time traveller. To confirm his suspicions, he gives you a series of passwords to tell him after resetting again and again until he gives you a key to his room. This means you now have to go all the way back to Snowdin to "finally learn the truth". But his room isn't unusual, after walking in the dark a bit, Papyrus comes in, turns on the lights, sees you on a treadmill, and asks if sans is pranking you across time and space, saying he hates when he does that. You read a note saying you were pranked, nerd, and you can also get another key. This key opens a door behind sans and Papyrus' house, leading to what looks like a small lab. This lab has blue prints written in strange symbols, possibly wingdings, and pictures in shelves of sans with people you don't recognize. There's a broken machine under covers. Toby Fox confirmed this machine can't be fixed... odd he would mention it right? And here's where my theory rockets into space...

As entry number 17 states, Gaster was working on an experiment, supposedly manipulating photons, possibly manipulating a force called dark matter. He refers to two people, and I believe them to be Papyrus and sans. The machine in sans' lab could be what Gaster fell into, causing his incident. Yet oddly, as it seems this made everyone belonging in the world to forget Gaster for the most part, sans still has these relics connected to Gaster. The experiment was manipulating time and space... like sans does! Papyrus acknowledges this, saying he hates when sans pranks through time and space, and sans seems to exercise these powers plenty of times.

Throughout the game he seems to be everywhere at once, he can take shortcuts through places that lead to areas they don't seem like they should, he is aware of when the player repeats a process through game files and resetting to previous saves. AND DON'T GET ME STARTED WITH HIS BOSS FIGHT. According to the description, his attack and defense are both 1, making him the "easiest enemy". sans. The easiest enemy. In truth, he DOES only do one damage and have one defense. He dies in one hit, but negates this by dodging every hit until the end, and while he does one damage at a time, his attacks ignore damage invulnerability, meaning he can do 40 hits per second. AND HE HAS LASER CANNONS. Where did he get these abilities? The answer is simple. If you just look in the sprite files, his laser cannons are called Gasterblasters. In his fight dialogue... well, the quote is in my signature isn't it?

• our reports showed a massive anomaly in the timespace continuum. timelines jumping left and right, stopping and starting... [Attack]
  
• until suddenly, everything ends. [Attack]
  
• heh heh heh... that's your fault isn't it? [Attack]
  
• you can't understand how this feels. [Attack]
  
• knowing that one day, without any warning... it's all going to be reset. [Attack]
  
• look. i gave up trying to go back a long time ago. [Attack]
  
• and getting to the surface doesn't really appeal anymore, either. [Attack]
  
• cause even if we do... we'll just end up right back here, without any memory of it, right? [Attack]
  
• to be blunt... it makes it kind of hard to give it my all. [Attack]
  
• ... or is that just a poor excuse for being lazy...? hell if i know. [Attack]
  
• all i know is... seeing what comes next... i can't afford not to care anymore. [Attack]
  

He doesn't care much about trying in life cause of his powers, isn't that right? And he says he and some other people detected the timespace anomaly caused by the save feature, proving this former scientific relationship with Gaster. It should have been weird from the start, before the only other character breaking the fourth wall of the game was Flowey, but that was due to him having the power to save before. Did sans have this kind of power? If Gaster fell into a machine, presumably the one in sans' lab, and this made him scatter across time and space, the machine must have had properties to manipulate space time. Perhaps sans used the machine and Gaster's other technologies like the Gasterblaster to gain his powers, and what if sans himself caused the accident with Gaster!? That "dirty hacker" ending, sans referencing your abilities, owning what seems to be what is left of Gaster's existence aside from the core...

In specifics, I believe the power sans has is the ability to read the code of Undertale. Now in real life, it is believed Toby Fox had Gaster planned in Undertale, but scrapped him from the game... but lore wise, maybe sans did cause Gaster's incident and then removed him from history, and everyone connected to him. It is YOUR messing with the code that brings forth people who remember Gaster, people who lived in the world, resembling other characters, they might have been the originals until replaced with the current versions. Gaster now lives on in the game's code, watching everything in the world of Undertale. Could our beloved sans commit such a devious act? Who knows...

If you stuck to the end of this, thank you! It means a lot if you read ALL OF THIS. That was a lot of evidence man, and I think this theory makes a lot of sense. Well of course it would, I made it, but doesn't it have lot's of back-up evidence? Be sure to post your opinions, and your own takes on the story. Anyways, thanks for reading, cya... that's it, that's my outro, I'M WORKING ON IT OK!?