Grunty had a whole lair full of worlds... which were all full of monsters. And I guess the Tower of Tragedy was kinda like a castle?

... There was a sandcastle too, back at Treasure Trove Cove. [Though that only had one stupid wisetalking crab. Who kept getting his shell kicked whenever Banjo and Kazooie went in there.]

But the battle with her was pretty tough. She kept throwing magic fireballs and they just wouldn't quit! But we got her eventually - and when she tried her final attack, she missed like a chump! [Only because the producers didn't have time to implement that.]