I’ll piggy back on what Tim said and also recommend that you add an IF on the Page Show – If you want to allow learners to return to the page without having to go through the process again, you may want to add an action that will allow the Next to show if they’ve already completed the page.
I use a variable that is increased by one each time an item is clicked:
onClick – Add to variable (ie, clicked_item)
onClick – Show next if “clicked_item” is greater than or equal to “x”
Then you could add to the Page Show action Tim mentioned another IF that shows the Next button if the variable is greater than or equal to “x”.