Yesterday I spent all day nailing out a Portal 2 map. Steam says I’ve spent 7.2 hours in the Portal 2 Authoring Tools, but I do not believe that at all. It was an all night dealie I tell you what. And as it turns out, Valve is hosting a mapping contest, so I’m tossing it in.
In any case, here it is! Extract the BSP file to C:\Program Files\Steam\steamapps\common\portal 2\portal2\maps, then when you start up Portal 2, punch “map sp_gottagofast.bsp” into the console and bam you’re in. (You don’t need the other two files in the ZIP, those are just requirements for the contest entry.)