UNDERTALE: Secrets and Easter Eggs

Secrets and Easter Eggs in Ruins

Conversation Changes when Dodging Flowey's Bullets Continuously

At the start of the game, if you continuously dodge Flowey's bullets, the conversation will change. If you intentionally get hit as Flowey suggests, you will take damage but be praised. However, if you dodge all the bullets, you will take no damage but receive harsh words instead.

Waiting at Toriel's Waiting Spot

After parting ways with Toriel in the Ruins, wait at the designated waiting spot as Toriel instructed. After a while, Toriel will call you. If you wait for an additional 5 minutes as instructed, you will receive another call and be able to check on Toriel's well-being. If you continue waiting, you will receive phone calls at regular intervals.

There is a 4th Froggit in the Room with 3 Froggits

When you arrive in the room with 3 Froggits, examine the wall. There is a crack between the first and second Froggits from the left, and by examining it, you can discover another Froggit.

Playing Music by Sleeping in the Bed after Killing Toriel

After defeating the Toriel in the Ruins, instead of proceeding straight to Snowdin, return to your room in the Ruins. If you sleep in the bed, you will hear special dialogue. During the dark period in the room, you can listen to a limited-time song. Turning on the lights in the room will cause the BGM to stop.

Hidden Features and Easter Eggs in Snowdin

Obtaining the Key to Sans's Room

To enter Sans's room and Sans's lab, you need to repeatedly face Sans's judgment that occurs only in the Neutral Route. By doing so, you will obtain the key and be able to enter. It's not necessary to go there, but if you want to enjoy Undertale to the fullest, give it a visit.

How to Enter Sans's Room and Obtain the Key

Opening the Sealed Door

The sealed door can be opened by fulfilling certain conditions in the Pacifist Route. Avoid all the names that appear during the Special Thanks credits in the Pacifist Route. Once you successfully avoid all the names, a message saying "A door somewhere has opened...!" will be displayed. Continue your journey and return to Snowdin to investigate.

Location of the Sealed Door and How to Open It

Hidden Elements and Easter Eggs in Waterfall

Paying Tuition to Obtain Temmie Armor

You can obtain the strongest armor, Temmie Armor, in the Neutral and Pacifist routes by purchasing tem pay 4 colleg for 1000G at the shop in Temmie Village. The price of Temmie Armor decreases based on the player's number of game overs, but it will always cost a minimum of 1000G. Earn gold to acquire it.

Obtaining and Uses of Temmie Armor

Obtaining Dog Residue through Piano Puzzle

Solve the piano puzzle and examine the Legendary Artifact in the hidden room to obtain the Annoying Dog. Furthermore, using or dropping the Annoying Dog will make it disappear and fill your inventory with Dog Residue.

Money-Making with Dog Residue

Using Dog Residue will fill your inventory with either more Dog Residue or Dog Salad. Dog Residue can be sold for 1-4G, and Dog Salad can be sold for 8G. By repeatedly selling them, you can efficiently earn gold.

Piano Puzzle Guide and Rewards List

Hidden Elements and Easter Eggs in Hotland

Balancing a Hot Dog on Your Head

If you try to purchase a Hot Dog with all 8 slots of your ITEM inventory filled, Sans will balance the Hot Dog on your head. It can stack up to a maximum of 30 Hot Dogs, but if you try to add a 31st one, Sans will refuse, saying that he can't reach it.

Hot Dogs Cannot be Obtained After Defeating Papyrus

The "Hot Dog..." that can be purchased from Sans in Hotland cannot be obtained if you defeat Papyrus in Snowdin, regardless of whether you are on a Genocide or Neutral route. Therefore, you need to reach Hotland without defeating Papyrus to get the Hot Dogs.

Placing a Hot Dog in the Gap at the Hotel

By placing a "Hot Dog..." in the room at the far right of the MTT Resort, you can obtain a healing item called Hush Puppy. If you have a Hot Dog while progressing through the Neutral or Pacifist route, go to the room at the far right of the MTT Resort and obtain the Hush Puppy.

Hot Cat will be Refused

If you have both a Hot Dog and a Hot Cat, attempting to place the Hot Cat in the gap will be met with a growl of refusal. Make sure to only have the Hot Dog in your ITEM inventory before placing it in the room at the far right.

Guide on Obtaining and Using Hush Puppy

Hidden Monster Appearance Conditions

Glyde 【Snowdin】

Glyde appears when you keep moving in front of the mysterious door below the forest in Snowdin for about 3 minutes. He won't appear if you fight Papyrus, so head to Snowdin before the Papyrus battle to encounter him.

How to Find and Spare Glyde

So Sorry 【Hotland】

So Sorry is a monster that appears in the area with a cactus in Hotland R2F. The conditions for his appearance are that your device's time is between 8:00 PM and 9:00 PM on October 10th and you have visited the MTT Resort at least once. He can also appear if you change the time on your device, but do so at your own risk.

How to Find and Spare So Sorry

Mad Mew Mew [Switch Version Exclusive]

Mad Mew Mew is a monster that appears only in the Switch version of the game. She is inside Papyrus's house in Snowdin after the Mettaton EX battle in both the Neutral and Pacifist routes. To enter Papyrus's house, you need to have completed Papyrus's date event.

How to Find Mad Mew Mew's

List of Other Hidden Elements

Hard Mode

Hard Mode is one of the bonus elements and Easter eggs in UNDERTALE. It can only be played in the Ruins area at a higher difficulty level. To play Hard Mode, enter Frisk as your name on the name selection screen.

How to Play and Tips for Hard Mode

List of Useful Guides

Story-related Guides

Helpful Guides

Compilation of Undertale Guides