Here are our Cheats for Undertale on Playstation 4. The most trustworthy items get the most 'thumbs up' from our users and appear nearer the top!
Enter Frisk on the name select screen. The game will warn you after yes, saying "This will make your life hell"
Hit yes to start a different game than Undertale. There are new and different monsters, running is prohibited on the first turn, and you can only play past Toriel, before the game gives you a joke ending.
While not traditional cheat codes, entering certain names when prompted to name the fallen human will give you a special message or effect. Most of these are names of characters in the game, causing the character in question to either object or allow you to use it.
Note: you cannot change your name unless you perform a True Reset at the end of a pacifist playthrough or complete a genocide playthrough. Some names are forbidden, and the game won’t let you use them at all.
Alphys – “D-don’t do that.”
Asgore – “You cannot.”
Asriel – “…”
Flowey – “I already CHOSE that name.”
Sans – “nope.”
Toriel – “I think you should think of your own name, my child.”
Undyne – “Get your OWN name!”
Gaster – No message; the game reloads the title screen.
Names With Effects/Messages
Frisk - “WARNING: This name will make your life hell. Proceed anyway?” This allows you to access Hard Mode. Hard Mode ends at the end of the Ruins section. It features stronger monsters, fewer healing items, and altered dialogue. Since you can’t complete the game in Hard Mode, you are allowed to pick a different name when you reset.
Chara - “The true name.”
Murder or Mercy - “That’s a little on-the-nose, isn’t it...?”
AAAAAA - “Not very creative...?”
Bratty - “Like, OK I guess.”
Catty - “Bratty! Bratty! That’s MY name!”
Temmie - “hOI!”
Aaron - “Is this name correct? ;)”
Woshua - “Clean name.”
Metta, Mett, or Mtt - “OOOOH!!! ARE YOU PROMOTING MY BRAND?”
Jerry - “Jerry.”
Papyru - “I’LL ALLOW IT!!!!”
Alphy - “Uh.... OK?”
Napsta or Blook - “............ (They are powerless to stop you.)”
Bpants - “You are really scraping the bottom of the barrel.”
Gerson - “Wah ha ha! Why not?”
Shyren - “...?”
Drak, Gigi, or Gugu – No message; the item Steak in the Shape of Mettaton’s Face, which is normally abbreviated in the inventory as FaceSteak, will instead be abbreviated as Fsteak. This is a nod to the webcomic Hiimdaisy’s parody of Persona 4, in which Chie is obsessed with steak and picks “Fsteak” as a word beginning with F. (“Fsteak” later appeared in Persona 4 Golden as part of a line said by Marie, which is both a legitimate translation of the Japanese dialogue and a nod to the comic.) The creator of Hiimdaisy, Gigi DG, worked on art and testing for Undertale.
There are 2 ways to do this. If, by the impossible chance you have, have 9999999 gold, you can purchase Spider Cider or a Spider Donut just before the Muffet mini-boss fight. Upon doing so, she will let you pass without a fight.
However, if you are not a dirty hacker, you can still skip her!
It is simple: In the Ruins, you can find spiders selling Spider Donuts and Spider Ciders in their webs for 7/18 gold. If you save this until Muffet's battle and then use the item to heal, she will end the fight. That means right away before she even attacks you, you can get her to spare you.
Doing this will make her a one-hit kill, or spareable, whichever you decide!