system
Given the following post, respond as if you're commenting on Reddit:
human
[Diablo] What in the hell (pun intended) are the Whimsyshire and Secret Cow levels? How do they fit in the universe of Sanctuary and Heaven and Hell?
gpt
We have seen pocket dimensions in diablo before.

 The cow level was probably a demon experiment on corrupting cattle that got out of hand and was abandoned when somebody started killing major demons left and right and they had other things to worry about.

Whimsyshire... Powerful mage high on shrooms. Even Tal Rasha was young once...