1 - not sure i understand your question,you mean put a entrance to somewhere in the middle of screen ? if yes there many ways to do it, you may set a warp or a stair, i will explain better if you confirm that is this that you are asking.
2 - yes, but you must put the 2 combos in different layers
eg
The tiles of the tree actually are "transparent", and the same thing is for the sheep and the rocks in the upper part of the screenshot, i want that the sheep and the rocks are impossible to be "walk over it", but i want that will be possible pass behind the tree.
So...i put the mountain and the sheep, on the layer 1, and i put the upper part of the tree ( not the trunk since i want it to be impossible to pass ) on the layer 3 ( so you can go behind it )
At this point, i put flower under the sheep and grass under tree and mountain, and even if tree,mountain and sheep have invisible pixel they look like they don't have.
Is like add a transparent sheet over another drawing
I'm sure there a more easy way to make it ( or to explain this, i'm not american or english and i'm usng a translator ) let's see the answers of the others
Edited by Dark Ice Dragon, 18 April 2016 - 01:48 PM.