When you want a general-purpose "click" event, the "when stage clicked" event may not be sufficient because it isn't triggered when a sprite is clicked. The "when this sprite clicked" event obviously isn't triggered when the mouse clicks an unoccupied section of the stage. You can create a custom, all-purpose click event with the "when timer >.." event. Click the stage or the left sprite. See inside sprite2.
Note: This method can be used to create a custom "event" from any Boolean condition. Credit to @ggenije for this tip
