When you are playing games in your Course Assignment and have successfully completed all of the games, you are ready to move on to the next Assignment. You must achieve the target score or better on all Quizzes.
You move to the next Assignment by clicking the bar at the bottom of the list of games. This tells the system that you are ready to move forward.
Do not try to go to the next Assignment unless you have gotten target scores on all of the Quizzes. Your "My Courses" button will always show your courses history and your scores, and you can go back later and work on games that you need more practice with.
The "All Games" menu allows you to play games outside of your assignments.