You will be shown a map with red markers for the 100 largest US stadiums. Double-click on the one specified to answer it. If you click on the correct stadium, the marker will turn green. Otherwise no change will be made to the markers.
Note – you may want to zoom in if stadiums are close to one another to make sure you are clicking on the correct one.
If the red markers do not appear when the quiz is loaded, try refreshing the page.