Abstract: A modular exercise, play, and living apparatus for cats includes a support frame having a base, a plurality of elevated platforms, and a plurality of upstanding frame members which extend between the base and an upper-level elevated platform. The support frame includes a plurality of slidably interlocking dovetail joints connecting the various support frame components to allow interlocking assembly and subsequent disassembly of the support frame. This allows the support frame to be disassembled and arranged in a knocked-down shipping arrangement. A plurality of compartments are supported by the support frame, including a living compartment, an eating compartment, and a litter compartment. A number of optional cat toys are mounted on or around the intermediate-level shelf.