Duck Pond Memory Game

Here's a little game I created for ELC-148: Checklist interactions. It's a very simple memory game but boy did a LOT of work go into figuring out variables! I'm pretty happy with the results and my kids had fun playing. The only issue is that I want the ducks to go to a visited state on each layer  so they remain gray based on variables and I just can't seem to get it to work. The source file is attached to the resources link in the course. Have fun playing and let me know if you see a solution to keep the ducks gray on each layer based on the variable changing :)

click here for demo