This is the latest update to Cavewars. This version allows you to
select the number of levels in a game, from 1 to 5.  All other levels
are filled with rock.  You can still tunnel to them, and mine minerals
there, but all players will start out in one of the open levels.  This
is in response to people wanting shorter games.

To install the update, copy the cavehigh.exe file to your Cavewars
directory, and copy the levels.fdg file to the cavewars\dlgs directory.

Avalon Hill Customer Service