STORE COMMUNITY ABOUT SUPPORT
Containing item: "Monoportal: Aphelion"
MonoportalCollection by Gigopler
A series of maps in no particular order that aren't very long, but only allow the player to place one portal and manipulate the location of the other portal using testing elements.
SingularCollection by AD_79
These are BEEmod test chambers with one thing in common: They all force you to use the single portal device. The tests are not too difficult, but you will become more familiar with one portal as you solve the tests.