Here's an example that uses rand and unrand as described previously to generate an 8x8 world of 64 screens without having to use variables to track what type of screen is in what position.   I also track whether each screen has been visited, and an eye icon shows at the bottom of the screen if the current screen has been previously visited (using the 6lives minikernel to display the icon).   Bad graphics aside, I think this is more or less what you were going for?  
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