Self control can be synonym of emotion regulation and is associated with positive well-being and reducing in externalising behaviour at home and at school. A child has to learn how to regulate his/her emotions in order to better interact with people. For instance, a child has to learn that it is ok to be angry but that it is not ok to hit people. Before being able to regulate emotions, a child has to be able to identify emotions.
You are struggling to finish a puzzle
Pause and take a moment to cool off. Try taking 5 deep breaths, for each breath count slowly to 10. Relax your body muscles. You could distract yourself by doing something else then returning to the puzzle later. Also sharing your frustration with a friend can also help.