Demo 1 has one hotspot, and it is large: roughly 378 by 156 pixels across the left side of the canvas. Generous hotspots suit a first-time viewer who doesn't yet know what is clickable, and the original app offered a show links switch for anyone still unsure.
The frame above is drawn at the original proportions. Each dashed box sits where the 2009 hotspot sat and links to the same screen it did then, so the tour can still be walked end to end.