Hard Quiz 6-35

In one of the hardest, quizziest episodes yet, four experts head into battle wielding nothing but their brains, armed with their expert knowledge in Sylvester Stallone, Leeds United, labyrinths, and rats. Let's play, hard!

It's another classic line-up as experts on flags, Bruce Springsteen, the stage musical Hamilton and Japanese artist Hokusai fight it out. Only one will prove worthy of Tom Gleeson's Big Brass Mug.

Tom Gleeson squeezes another four so-called expert contestants through the Hard Quiz wringer on subjects: mountain gorillas, US sitcom How I Met Your Mother, costume designer Edith Head, and the general theory of relativity.