In this activity, you can manipulate a system made up of ramps, switches, and gears. Marbles roll through the system and eventually hit a lever attached to a flagpole on the right side of the system. Each time the marble hits the lever, the flag goes up. If the flag falls all the way to the bottom, the system has broken down. You must keep the flag from falling all the way to the bottom while removing parts of the system. The "Learn More" button provides you with background information about systems and encourages you to think about what you have learned in the context of other systems.