UNDERTALE: True Laboratory Puzzle Walkthrough

Obtaining and Using the Red Key

Obtained after completing the Memoryhead battle

The Memoryhead appears when you examine all three sinks. Since it cannot be damaged, end the battle by choosing the Spare option and obtain the Red Key.

How to Defeat and Spare Memoryhead

Used in the Room Next to the Sink

The Red Key is used in the room next to the sink. Using it will open the door in the top right corner of the save point, allowing you to access another room.

Obtaining and Using the Yellow Key

Obtained by Examining the Bed

The Yellow Key can be obtained by examining the bed on the top right. Note that examining the bed on the bottom left will give you the option to lie down, and you'll witness a mysterious monster tucking you in.

Used in the Room next to the DT Extraction Machine

The Yellow Key is used in the room next to the DT Extraction Machine. Additionally, examining the TV will allow you to view tapes related to the story.

Obtaining and Using the Green Key

Obtaining in the Bathtub Room

The Green Key can be obtained in the room with the bathtub. Note that there will be a special effect, but no battle will occur.

Using in the Room next to the Refrigerator

The Green Key is used in the room next to the refrigerator where the Blue Key can be obtained. There is nothing else to do, so it is fine to move on after using the key.

Obtaining and Using the Blue Key

Obtaining after the Snowdrake's Mother Battle

After the battle with Snowdrake's Mother, examine the leftmost refrigerator to make the key appear. End the battle with Snowdrake's Mother by sparing her, then obtain the Blue Key.

How to Spare Snowdrake's Mother

Using in the Room next to the Mirror

The Blue Key is used in the room next to the area with the mirror. After using all the keys in the slots, return to the location with the save point and ride the elevator.

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