Item needed in Mini and Maxi? (spoilers)

[Zarrg]

I am near then end of the story I think but I have run into a wall, literally actually. When I enter the micro realm on the robot I eventually reach an area that has a tunnel too small for mini to go through, and I am already in the micro layer so I can't get through it that way - I am stuck now and It feels like I have completed pretty much all quests I can think of (there is some stuff with the lightbulb people but is that really something that would be connected to progression?) and explored all the map. Any hints to what I am doing wrong?

[a cosmonaut]

theres a potion that lets you shrink even smaller you can buy in a hexan town, near the old ladys house (the one maxi stands on the roof of early on) next to 4 dust clods

[Zarrg]

Originally posted by a cosmonaut:

theres a potion that lets you shrink even smaller you can buy in a hexan town, near the old ladys house (the one maxi stands on the roof of early on) next to 4 dust clods

Sorry I found this out a while ago and was meaning to update my message, I missed the obvious place hexan town (I really should have checked since I already knew that shops could sell quest/progression items) but randomly found it in a cave, someone mentioned to me on discord afterwards that they had found it in the hexan town.