Editor Elements

Red grid lines: The actual game resolution (640X480,240X320,etc.)
Orange grid lines: Actual grid size.
White rectangle: "View Actor".
Yellow rectangle: Activation Region
Green rectangle: Wire Frame Region
Blue rectangle: Filled Region
Cyan rectangle: Canvas Actor
Gradient Line: Activation Event
White cross: Game center
Pacman: Initial Actor icon

Zoom: +/-  or  >/<  to zoom in or out while in the Game Editor.