Only two "attempts" at a freeform questions... how exactly to set it up this way... (read on)

I've created a freeform quiz slide that looks like a Jeopardy type board. When the user clicks an answer, he gets feedback either correct or incorrect.

Is there a way to stop the learner from choosing more than two buttons on the slide before it continues to the next slide?

If I just set it to two "attempts," it still lets the learner click  all the buttons, in effect choosing all items if needed. 

The only way I can think of is to set some complicated triggers to get the question to move forward after two mouse clicks on the button choices. This setup isn't my choice, it's what the person who assigned this module to me has asked for.

 

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