Our 20-year-old kitty is deaf and blind (and incontinent), so we got this kitty playpen for her.  In its normal configuration it didn't work well because there was not enough room on the floor for her litter box, her food, and her bed. In addition she couldn't safely jump up to the higher levels.  So we just flipped it over onto its side (the wheels were easy to re-position), put a cardboard base down, used two of the shelves as dividers between the litter box side and the food side.  Now she has a spacious playpen that gives her to move around in and that keeps her sleeping pad and her food dishes far from her litter box.  It's easy enough to get into it from above, where the doors are now located.  We're very pleased with the result.