What does "How the mazes are carved" change?

The character of the mazes: "Long winding paths", "Even and fair", "Many short dead ends", "Branchy", "Mixed" or "Winding, few dead ends". The default, "Each level its own (recommended)", uses Long winding paths for Very easy and Easy, Mixed for Medium, Even and fair for Hard and Expert, and Many short dead ends for Extreme. Choosing another carving makes the mazes again.