The original lesson was intended for 8th grade students and took 8 class periods.  I challenged elementary students (grades 3-5) during a STEM night to use available materials to create a pinball machine.  Students needed to make a circuit that when a ball landed in a cup or hit a target, a buzzer would sound.  The activity took the students approximately 20 minutes to complete.  If students are expected to start from scratch, they will need approximately three class periods to design, create, and present their games