That change still leaves a small bias in the case where there are 3 directions to choose from. The effect is presumably small (I don't know how many bits are pr

That change still leaves a small bias in the case where there are 3 directions to choose from. The effect is presumably small (I don't know how many bits are produced by scenario_rand()), but it would be assuming to try to figure out the maximum maze bias that is possible to extract from this.