Disable Retry Quiz Button after Two Attemps

Since you're only giving the user 2 tries, you can use a T/F variable*, with a default value of False. 

Use a trigger on the Retry button that sets the variable to True.

• Be sure this trigger appears before the one that jumps to the first question. 

Use a trigger on the Results slide that changes the state of the Retry button to Disabled or Hidden when the timeline starts, with the condition that the variable = True. 

• It'd be a good idea to also show a message explaining what the user has to do to get another chance to pass. 

* Note: To allow more attempts, use a number variable with a default value of 1. Use a trigger on the Retry button that adds 1 to that variable. Use a trigger on the Results slide that changes the state of the Retry button, with the condition that the variable = the maximum # of attempts.

Here's more info about conditions and variables: 

• https://community.articulate.com/series/articulate-storyline-360/articles/storyline-360-working-with-triggers#conditions 
• https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-variables