When I say easy/hard, I REALLY mean it. It can either be super hard, or super easy, depending on which one you do. I took at LEAST 15 tries on hard before I cleared it. But this is literally a boss rush. you're fighting a boss, while in a rush. Good difficulty curve on hard, I think. I recommend veterans and experts play on hard, newbies or amateurs (I'm probably a little better than an amateur, but not by much) should play on easy. Just a recommendation, not a requirement.