Add a perturbation method, possibly with genetic algorithm?

[sraaphorst]

Given an existing perfect maze and an objective function O(M) on mazes (e.g. branching factor, distance from start to end, etc):

1. Perturb by adding a number of walls to the maze.

2. Carve passages using some algorithm to result in a number of perfect maze children.

3. Breed the child mazes in some way. (Could be via dividing mazes into quadrants and swapping diagonal quadrants, or something similar.)

4. Kill off the worst children with respect to O(M).

5. Iterate for some number of generations.