Hotspot Help

The answer in Ron's blogs is a good one: create a Freeform Pick Many question. 

FYI: The nice thing about using shapes as the clickable items (instead of hotspots) is that you can give a shape a Selected state.

So, for example, the Normal state could be 99% transparent, so it's clickable but not visible. And for the Selected state, you could add something that indicates the item has been Selected (for example, add a checkmark, a glow around the shape, a visible fill to the shape, etc.)

Note: Because Selected is a built-in state, it will work automatically. The first time the user clicks the Normal state, it will automatically change to Selected. If they click it again, it will automatically change back to Normal.