Unlock all levels
     Open  with  text  editor  the  rebels.cfg  file  into  your  game
directory. Edit the following part of the rebels.cfg file:

    [game]
    language=english
    autovisibility=1
    displayhints=1
    subtitles=1
    tooltips=1
    tooltipdelay=0.000000

    Save, after run game as usual and you will have access to all levels. 

Level select
     Note:  This  procedure  involves  editing  a  game file; create a
backup  copy  of the file before proceeding. Use a text editor to edit
the   "rebels.cfg"   file   in   the   game  folder.  Find  the  entry
"checkvideo=#"  (must  be the very last). Set the value equal to 6, so
that  the  line  now reads "checkvideo=6". Save the changes, close the
file and run the game. You can now start on any level.