Decrease score on individual question

Hello! I support training for a call center. We have created "mock calls" - simulations with audio that give the learner a simulated call experience. I'm using the hotspot freeform question for the simulation slides. These are being published to xAPI. 

We also use a different product for simulations and are trying to create a similar scoring structure with the mock call sims. The scoring works like this:

• If they click correctly, they get 3 points. 
• If they click incorrectly, then click correctly, they get 2 points. 
• If they click incorrectly twice, then click correctly, they get 1 point. 
• If they click incorrectly three times, they get zero points and the action (mouse showing them where to click) is shown. 

How can I get Storyline 360 to do the same thing? I know how to adjust the score for a correct answer but can't seem to find how to decrease the score with each attempt. Is there a variable where the question score is kept? I was only able to find the question.correct variable, but that's true/false. Any suggestions would be greatly appreciated.