Even out the difficulty (from one game to another) somewhat. Instead
of a 75% chance that two large areas will be opened up on the left
and right sides of the arrival area plus 13.5 (avg) * 1.5 (avg) extra
monsters in that region, change to 60% chance that the left side will
be opened up with 7 (avg) * 1.5 (avg) extra monsters and a separate
60% chance that the right side will be opened up with 7 * 1.5 (avg)
extra monsters. The chance that both sides get opened up drops to
36% but the chance that neither side gets opened drops to 16%, with
difference made up by 24% chance each for just one side or the other.
I was a little surprised that this actually worked. I hope there's
a less clumsy way to have a loop index.
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