Where can I allow my rabbit to play?

He's still potty training,so a lot of times he has 'accidents'.
I feel horrible leaving him in his cage all the time but I dont know where I can let him hop without pooping on the floor,or hiding under things that are impossible to get him out of -_-
How can I conveniently buny-proof my room,or make an area where he can play?

in a really tall play pen that way they can jump around and they wont get out =D

Well its really hard to potty train a bunny
its almost inpossible
but all thats really good to say is you can put magazines
or those doggie training pads all over the floor .

why not put a play pen thing out side so it can hop around or put a leash on it and sit out there with it so you can watch what its doin

goodluck