Use nodes to mix 3 levels of alpha

Game Engine Game Engine Support and Discussion
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There are 3 images here ( alpha one might be a bit hard to see) :smiley:
How would I use nodes, and the Z Height of a plane to mix these into a overlay filter, (fog of war) ?

I was trying to use Land.blend as a reference, and I am terrible with nodesā€¦

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and here is the setup I was trying to clone,