How to make only 2 thing pre sable at a time

mrcameron999

i have 4 buttons that can only be pressed one at a time like so u can only use 1 finger. I tried doing this

When touch is pressed & attribute is false change attribute to true and then do what i want then i said. When touch is realised change attribute to false. How ever there is a glitch with this where u can tap it then move rue finger out of the are where u tap and the rule i said keeps happening