how to get gaster in undertale?

Undertale – How to find Gaster

If not messing with the files, there’s a 1 in 100 chance of getting the fun value 66. After that it’s a 1 in 10 chance that the door will spawn. So, there is a 1 in 1000, or 0.1% chance you can run into mysteryman without touching the game files.

Undertale Gaster Secrets

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