Drag and drop lightbox slide back to the layer

So i have created and interactive base but i want the user to click the next button to jump to the  drag and drop slide, which i have done.  The trick that i am trying to find out is, I want the next button hidden until they answer correctly and then have the next button appear, and once it does appear i want the next button to go back to the Base interactive slide to the next layer i want them to be at?  Any thoughts?

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