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Containing item: "Breaking Through"
Best SinglePlayer MapsCollection by His Boy, Elroy
I know it's a lot but these are all, in my opinion, great quality single player maps.
ThinkingWithPortals.com MapsCollection by wildgoosespeeder
Before the Portal 2 Workshop was a thing, the only way to play custom maps was to download *.bsp files (map files Source Engine games use such as Portal 2) from designated website members that created them in Hammer and use the "map" command in console to