Follow this detailed step-by-step guide to unlock and speedrun the secret ending in chapter 3 of Deltarune.

In addition to the regular ending of chapter 3 of Deltarune, the game also features another ending. Unlike the regular path, this secret ending is not tied to linear progression. You will need to complete several tasks, including playing a specific minigame, obtaining certain prerequisites, and defeating a hidden boss to unlock this secret path.
Here is a comprehensive article that contains everything you need to know regarding the secret ending in Deltarune.
Details of Secret Ending in Chapter 3 of Deltarune

You need to access the S room to play the console (Image via Toby Fox)
You need to follow these steps in order to unlock the secret ending in Deltarune (Chapter 3):
- Get the S Room Access
- Obtaining the Ice Key
- Obtaining the Shelter Key
- Obtaining the Shadow Mantle
- Fighting the Final Boss
Below are further details on them.
Get the S Room Access
You need to get access to the S Room first to play the old minigame in the Green Room. You need to achieve an S rank in Tenna’s game show to gain entry. Additionally, you can purchase S Room access from Pippins for 1,500 points.
Obtaining the Ice Key
Once you have access to the old console, the first item out of the required three to fight the final boss is the Ice Key. Start by picking up the sword and reaching Level Three by defeating enemies. Next, unlock a new area with a purple-blue hue and defeat the enemies there to max out your level, allowing you to cut down trees. Afterward, clear the forest near the starting point to get the Ice Key inside a chest.
Obtaining the Shelter Key

After claiming the Ice Key, earn an S rank in Tenna’s game show again to access the minigame. Now, claim the sword and reach Level Two to gain the power to remove ferns. Then, take the raft near the waterfall to reach the lake, and from there, use another raft to arrive at the white land area.
In this area, unlock the blue door using the Ice Key and defeat the enemies along the way to reach the maximum level. Head to the upper-right corner of the map to find the Mage, who will assist you in solving puzzles. Finally, unlock the final door with the Ice Key and collect the Shelter Key from there.
Obtaining the Shadow Mantle
Repeat the steps from the earlier two stages to play the minigame. Once in the game, use the opening to enter a new area. This zone lacks NPCs, so you need to give a little stab to Ralsei and Susie to increase the level. Continue progressing through the area and defeat the boss at the end to get a chest. Head to the edge of the minigame to let Kris step outside the screen and collect the Shadow Mantle from the chest himself.
Fighting the Final Boss
Finally, you will face the final boss of the game, the Roaring Knight. His attacks will quickly drain your HP, so be sure to equip the Shadow Mantle on one of your characters to gain an advantage. After defeating the boss, you will receive the Shadow Crystal, unlocking the secret ending of chapter 3.
That was all about the secret ending in chapter 3 of Deltarune.
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