Building off what Math said and some great timing, I put together a sample that I think matches what you’re looking for. Each time a drop item is released in a drop zone, a series of action groups are triggered:
- Set a custom variable based on whether a drop is correct.
- Display a message for each correctly dropped item
- Set the contents of a status indicator for each correct option
The setting of the custom variables is based on the variable values for the question (i.e. Set BMW correct IF question_0001 contains Car1-BMW or Car2-BMW, etc).
One minor issue I noted is that the action to start everything in motion has to be on each choice text AND has to have a short delay because it looks like the action group is run before the variable for the question is updated.