In the folder JUNK under the folder Barrage is
installed into is the file OPTIONS.DAT. Using
a hex editor, go right to the end of this file
to hex position 414. The three bytes at this
address when set to hex 21 21 21 allow access
to the first two levels of the six displayed on
the level-select screen.
Changing these three bytes to hex FF FF FF allows
access to all six displayed levels.