Forcing user to view four layers before "next" - formula issue

Hi there everyone,

I just recently learned how to force the user to view all layers in a slide before being able to press "next".  I am now trying a new variant of the formula and cannot quite get it to work just yet. I would like for the user to have to click all four objects in the room (the dog, the outlet, the beer bottle, and the fireplace) and visit all 4 of the layers before clicking next on the base layer, but I cannot get it to work. Here is the file. Any ideas ? Thanks !

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