Back texture: | The texture you see when you can look through all layers in front of it. |
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Back tiles: | The tile-based background. |
Interactive tiles: | Fixed tiles you can't go through. Used at the edges of 'walled' areas. These are lit. |
Interactive objects: | Gish, enemies, vehicles, moving platforms, etc. Simply where everything happens. Also lit. |
Front tiles: | Stuff in front of you. Used for decoration (like tubes at the Sewer), to fill 'walled' areas, for some tunnels and to hide secrets. |
http://home.filternet.nl/~eo000199/jonathan/gish/layers.png">