Now as far as having him play and be entertained in other ways...
may I suggest getting him a playmate? I got Roxy and TJ together and there are times that they both are at my feet, BUT for the most part they play with each other, the chase each other, wrestle and they have cage matches too! Its so cute, and they really do enjoy each other.
maybe you can still get one of his littermates? I am sure he misses them and would LOVE to have a forever brother or sister