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Motanum's Main Four

You get your introduction mini room, and afterwards you are droped on 4 rooms and you must make a laser travel through all four rooms to open your exit.

Good luck
Download from Thinking With Portals here.

Put the .bsp on your maps folder at steam/steamapps/common/portal 2/portal2/maps. Then to launch the map open your console and type in "map mp_motanum_main_four". It should drop as you type it.