This is a collection of coop maps using the confinement concept, where one player is trapped in a starting room while the other is outside doing things that contribute to the solution, and you have to keep switching out. Each map requires leaving portals so the other person can do something new, and then leave new portals and switch out again, and so on. Almost all of them have a confinement area unique to the map, and very different puzzles outside of them. The main goal is typically to get both people out at the same time, which can only be accomplished after reaching the end (usually). Anyone looking for a challenge can find all the difficulty one could ask for in this ever-expanding collection.

If we were to pick only the best ones from the collection, they would be Confinements 1,2,3,6,7,8,10,12,13,15,16,18,20,23,26,29,40,47, 48,49,13 Advanced, and Yandere Test. Those ones are the best, and most of the others either have some sort of problem or are just not as good/ creative/ unique. Sticking with the ones listed above will give the best experience imo.

Expected playthrough time: Several weeks