"I just think we're playing better," Sullivan said. "We're playing harder. We're playing smarter. I think we're executing and we've got good players.
"Their talent and their instincts are going to take over. When they do that, they're hard to defend. They're going to get quality chances because of the talent that these guys have. I believe with each game that we've played, we've gotten better."
Game 6 is an entirely different challenge for the Penguins, who have lost the previous two games at Nashville.
"We know we're going to have to be on another level," Sullivan said. "And we believe we have it. That's what we're preaching to these guys.
"It boils down to execution and effort. But certainly it's not like we've devised a new game plan."