Mart in the Mountains
The dimension most commonly known as The Mart is an infinite store with a literally endless variety of products on sale. Entrances to The Mart can be found all across the multiverse for the convenience of shoppers everywhere. From the outside, these entrances resemble ordinary, finite grocery stores, convenience stores, malls, and other varieties of stores. But once you step inside, you immediately find yourself in a gigantic supermarket with rows upon rows of aisles that stretch on forever in either direction. Look long enough, and you'll find any imaginable product somewhere in The Mart's endless shelves. Oftentimes entrances to this strange store seem to randomly spring up in the most unexpected of places, such as a desolate mountain peak for instance.
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