Earlier quoted context omitted.
Maybe he doesn't like to do different business in the same place? Try getting another box.
So at what point do you go insane? Should I just turn the whole place into a litter box? I have 3.
My cats don't like the uber-expensive clot-forming synthetic crystal litter, and don't like various types of alternatives either - almost none from this list: http://www.petco.com/Shop/ShoppingGuides/petco_ChooseCatLitt... )
..but they do love some simple pebbles, which are, fortunately, dirt-cheap (or pebble-cheap :) ) although a little messier to clean than the above alternatives. I think they'd like sand as well (I live in Uruguay and those pebbles are from Argentina, so I don't know what alternatives are in the U.S.).