Make an electric buzzer game
It's like the old "operation" game. Follow the diagram below to build the wire maze. Your wire maze must be a material that is electrically conductive. A coat hanger works as long as it does not have any paint on it. Attach a loop of a hanger to a wire, then attach the wire to the battery. Attach the battery (9 volt) to the buzzer (or light) using wire. Attach the buzzer to the wire maze using more wire.
Thread the loop of the metal hanger through the wire maze.
Measure the time it takes to get from one end of the maze to the other.
Also count the number of errors (buzzes) during each trial. Go through
the maze several times and plot the amount of time and number of errors
vs. the trial number on a graph.