How is Opening a Portal Activated?

[rynz500]

Is it activated by how many rooms you've cleared, or so? Because I've finished a small player dungeon with some leftover rooms left, but got the portal to open. However, when I played, what seemed to be, a big player dungeon, I opened the portal with a few rooms left as well. So how is a portal activated? Number of rooms cleared?

[Mara 🐿]

It feels percentage based, so if you clear 90% of a dungeon the portal opens?
Probably with a minimum amount of rooms remaining of 1 so you don't have to 100% the smaller dungeons.

[OxyOxspring]

It's a percentage!