Show Layer After Variables Met

I would like Layer 9 to only Show only after the learner has visited the other 8 layers. I've used True/False Variables for when a layer is visited but i just can't seem to get it to work correctly.

I searched the discussions and tried a few different methods but I'm missing something really simple. It appears that if you set it to when the timeline ends or starts, the variables need to be set to True at the exact moment in time (like a snapshot) and that doesn't work.