Cheats:

 There is a secret password zone in the about dialog box. Hold the
 [Shift] key and click on the black pixel of the right eye on the
 image of Bug. A dialog box will appear. Click in the box, type
 BABYSEALS, and click either the WOW! or YIKES! boxes (*not* the OK
 box).
 Now there is a new menu to the right of the Help menu. It does not
 show anything, but when the blank area just to the right of the Help
 menu is clicked, a new menu drops down with the following on/off
 choices:

 Level Skip - Duck/Crouch plus Up = skip forward one level
              Duck/Crouch plus Down = skip backward one level
 Flying Bug - Press [Y] to lift off and direction controls to move
              Note: If this is checked, the Level Skip cheat also
              works
 Invincibility - Enemies go right through Bug without hurting him
 Hitpoints - Bug reacts as though he's been hurt, but no hitpoints
             taken off