Seems like we're always connecting through Denver. I've never noticed a play area but we do't need those anymore with out 17 and 18 yo DDs. Just to add that Concourse B is the United/United Express terminal so if this is your airline you're good to go. Even without a play area there are so many things (Huge Crocks store, places to eat, all sorts of shopping) to make any layover go by quickly.