Disable Button until Quiz Passed

Hi all,

I have a Menu screen with 4 buttons that link to new modules.  My client has requested that each module be locked until the quiz is passed.  Can someone help with the variables and triggers I need to enable a disabled button when the quiz is passed? 

The Trigger link should should not work until the passmark is reached.  I've attached a VERY basic storyline file so you can see what I mean.. 

Sorry if this has been posted already, I couldn't find this information anywhere.

Thanks again...

Natalie.

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