*** HELP *** Creating a "SCRATCH OFF"
Good morning, Fellow Storyliners! I'm seeking ideas on how to create a "scratch off" interaction. Here's what I'm trying to do...
The course I'm building is for a cleaning machine. I've covered how to operate the machine and now I'm showing an item that needs to be cleaned (a refrigerator). I want the learner to "grab" the handle of the cleaning machine and "scratch off" the "dirt" from the fridge (3 -4 different areas). The user would click the cleaning attachment, hold it down, and drag it over the top of the dirty area until the "dirt" disappears. They would then move to the next dirty area and do the same thing. Once all the areas are "cleaned", it would show that the product cleaning is complete and allow the learner to move to the next interaction.
I've tried several different approaches with layers, states, and triggers but the solution (probably something simple) keeps eluding me.