The hotspot points in the image are now not visible. the become visible with mouse over.
All possible solutions, which means all hotspots, should be visible on the image. then I can chose the answer I want to.
In the beginning all hotspots are grey. the selected hotspots change the color (e.g. to blue, not red or green) and they become e.g. shaded (for the color blind) or transparence of 50%.