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MonoportalCollection by: Gig
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.
Monoportal CollectionCollection by: MrLux
This is collection of maps by Gig, his chambers have content from BEEmod. His first and exellent map named as Monoportal: Rescind. Download and play his chambers.