Disabling "Next" button until all layers and their respective timelines are complete

Hi all and thanks Wendy for the file,

I have the same issue but instead of using the timeline to change the layers, I want to change to another layer when another button is clicked.

Scenario:

- I have 3 buttons ("A, B, C") that goes to their respective 3 layers ("Apple, Ball, Cat"). When you click a layer, you can move to another one, so on and so forth....

- The default player "Next" will only be clickable once all the layers have visited.

What I have done:

- show layer "Apple" when user clicks button "A" - created this trigger on all my layers

- show layer "Ball" when user clicks button "B" - created this trigger on all my layers

- show layer "Cat" when user clicks button "C" - created this trigger on all my layers

- on my Base Layer, I have created a variable "X" and assigned to "False"

- on my Base Layer, I have created a trigger: Set "X" to value "True" when the state of all the buttons are Visited

- on my Base Layer, I have created a trigger: Jump to the next slide when user clicks Next if "X" = value True

However, the "Next" is not working.

Can someone help please?

Thank you so much