Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding. Using a text editor, edit the "Bumps_save_1.sav" file in the "\Program Files\Bumps" directory. You will see values associated with each room as follows:
[room1] locked=0 medal=g
Change the lines under every room number you want unlocked to include the "locked=0" and "medal=g" lines.