From Cubic Castles Wiki
"Blue Portal" is a stamp that can be used upon doors.
How to obtain
- Similar to the default door stamp ( Purple Portal ) ,this stamp changes The Portal's Background from purple to blue.
- Once Placed, it can be removed by using other Door Stamps.
- Door Stamps are not refundable or exchangeable. Swapping existing stamps upon a door, will result in the loss of the previously placed stamp.