when you say z and y axis what exactly do you mean?
Here's a project that has four way scrolling you could download it to see how it works: http://scratch.mit.edu/projects/FangedGamer/334364
Here's a project that has a scroll bar: http://scratch.mit.edu/projects/Zelda123/227158
and here's a forum that explains scrollig: http://scratch.mit.edu/forums/viewtopic.php?id=2440
Hope that answers your question
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you have a premade example in the games folder which is in the project folder
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