I understood the first half of your idea, but cannot realize the fact how to check the clickable variable.
Can you look at this example and put a light on my errors please? I would be very thankful! I did the first half. Now I am stuck...
I want buttons be unclickable while x2 is pressed. capx:
drive.google.com/file/d/0B09lLdP7JoIASWZ2UDBMM1kxM3c/view?usp=sharing