Get to Stage 4! (Maybe you can do it earlier, have not tested yet).

I used the door on the far left of the entrance.

Lure the fairy to the bottom of the door, then quickly go to the opposite side of the door. This should make the fairy stuck along the bottom portion. Stand near the shiny balls like a moth.

I highly recommend turning on the steam overlay using: Shift+Tab.

This will allow you to have a relaxed farming session without worrying about accidentally poking your mouse and ki-*ehem* "pichuun"ing the fairy.

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