Graphics and Sound Effects: Labyrinth - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 253

Figure 8-8. Change to False rule
Duplicate the rule by dragging it down while pressing the Option key. Name it
''Change to True.'' You will basically reverse the results. Apply ''All'' to the
following conditions:
 ''Attribute'' ''game.OpenDoor'' is ''false''
 ''Actor receives event'' ''overlaps or collides'' with ''actor of
type'' ''ball''
 ''Attribute'' ''Open Door.Timer'' ''='' ''0''
Then drag and drop a Change Attribute behavior and change game.OpenDoor
to 1.
Drag and drop a second Change Attribute behavior and change Open
Door.Timer to 1.