Receeding Goblins & Gremlins: an unsuitable sandboxy encounter not really designed for a party of 3rd–5th level Murder Hobos
clobbered together from a mish-mash of Old School RPG retro-clone rulesets (it kinda made sense at the time . . .)
Hidden at the back of a goblin lair is a two-way inter-dimensional space/time portal to a used car lot in Cleveland, Ohio, circa 1976; the goblins do maintenance on AMC Gremlins for cases of Pabst Blue Ribbon and cartons of Belair menthol cigarettes. What your PCs do there is up to you.
Grab the PDF from my blog:
http://rendedpress.blogspot.com/2014/02/another-gift-for-you.html