It's magic grass that doesn't need the sun

Bogie picked it up of of cgtextures, where did yours come from? I like those much better than anything I have. As for the stairs, the only reason I used that shadow was to show them going up.

Here's the update on level one with you're opacity suggestion wdmartin
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and floor 2 with some things added. I have a shadow going on the far right passage of the map to simulate an exaggerated darkness for no reason other than the fact it's not in a man made area. I kinda just liked it.
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