There’s an entire realm of content in Undertale beyond its core narrative and the various settings players explore. Within the game, numerous secret codes, special items, and even glitches exist that can introduce players to experiences they might have missed. This can significantly enrich the gameplay, offering fresh perspectives to both newcomers and returning players.
Discovering all the possible secrets and cheats can be a challenging endeavor, given the sheer volume of options. To assist you in uncovering every hidden feature, here’s a comprehensive compilation of cheats and secrets available in Undertale.
Complete List of Secret Passwords in Undertale
Many hidden passwords can be entered while naming the main character at the game’s start. Using these names will trigger unique dialogue interactions. Here’s a rundown of the names and their corresponding effects:
| Name Password | Dialogue/Effect |
| Gaster | Restarts the introduction sequence |
| Shyren | «…?» |
| Blooky, Napsta | «… (They’re powerless to stop you.)» |
| Asriel | «…» |
| Catty | «Bratty! Bratty! That’s MY name!» |
| Woshua | «Clean name.» |
| Alphys | «D-don’t do that.» |
| Undyne | «Get your OWN name!» |
| Temmie | «hOI!» |
| Flowey | «I already CHOSE that name.» |
| Toriel | «I think you should choose your own name, my child.» |
| Papyru | «I’LL ALLOW IT!!!!» |
| Aaron | «Is this name correct? ;)» |
| Jerry | «Jerry.» |
| Bratty | «Like, OK I guess.» |
| Sans | «nope.» |
| AAAAAA | «Not very creative…?» |
| MTT, Metta, or Mett | «OOOOH!!! ARE YOU PROMOTING MY BRAND?» |
| Murder, Mercy | «That’s a little on-the-nose, isn’t it…?» |
| Chara | «The true name.» |
| Alphy | «Uh…ok?» |
| Gerson | «Wah ha ha! Why not?» |
| Bpants | «You are really scraping the bottom of the barrel.» |
| Asgore | «You cannot.» |
| Frisk | Unlocks Hard Mode |
Complete List of Cheats in Undertale
There are several cheats available in Undertale designed to assist players during challenging encounters or help them navigate the game with greater ease. Below is a list of effective cheats you can use:
| Cheat Code | Effect |
| Infinite Money | Acquire Dog Residue and use it to fill your inventory. Then sell the excess Dog Residue back and keep one to continue generating wealth. |
| Punch Card Glitch | Obtain a punch card from the nice cream vendor in the Waterfall. To skip cutscenes, buffer the menu right as a cutscene starts; this enables you to proceed while freely moving about. |
| Glyde | To make Glyde spawn, be in the Mysterious Door room in Snowdin, moving around for two minutes or longer before engaging with Papyrus. Avoid defeating any enemies in Snowdin during this time. |
Complete List of Secret Items in Undertale
Players can unlock various secret locations, bosses, and items throughout Undertale. Here’s a summary of everything you can strive to discover:
| Secret Item/Location/Enemy | How to Unlock |
| Developer’s Room | Head to a large door in Snowdin that is typically locked, then complete the credits while avoiding all names to access it. |
| So Sorry | Found in the Art Club Room in Hotland, ensure your clock is set to October 10th at 8 PM and be on the Genocide Route before the battle. |
| Sans’ Room | Complete the True Pacifist Route; after speaking with Sans in New Home, save and exit before repeating this process two to three times to receive a key to his room. |
| Sans’ Hot Dogs | Purchase various items from Sans in Hotland, such as Head Dog and Hot Cat, following specific purchase conditions to unlock each item. |
| Gaster’s Followers | Change the game’s code from ‘fun’ to ’66’ to encounter characters discussing Gaster in Hotland or Waterfall. |
| Temmie Village | Illuminate all mushrooms in the dark area within Waterfall, then follow the path south to find the village filled with Temmies. |
