Help Needed: Block Third Card Click and Same Card Re-Click Before Matching is Complete

First step in getting this working properly is removing the states and just use plain images and add triggers to them. Front ( brown shape ) side of the card has a trigger to hide itself.

The image is hidden below the brown shape. So becomes visible then.
That image has a trigger to show the appropriate brown shape.

As you see i name all elements. Making it easier to get things organized.
RULE 1: Always NAME layers properly

Next step is adding a variable 'cardsClicked'.
Then we add a trigger to both the all front and all cards.

On the front the variable gets 1 added and on the card itself 1 is subtracted.
Now we have a value we can use as a condition to prevent clicking a third card.