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Download and extract Slick2D Libraries.
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Include "slick" library in Java project.
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Put filepath to slick\lwjgl-2.9.1\native\windows in VM Options in the Run tab in the project's properties. eg: -Djava.library.path=...\slick\lwjgl-2.9.1\native\windows
Raycasting help from maciej-nowicki's simple-raycaster