Something like this:
Where X is not passable on any level. But if it was level specific it would be red with a number.
EDIT:
Got bored:
The first one is the level changing permission, the other green one is the multi-level permission. You get the gist.
The purple and orange tiles do nothing, as far as I know?
EDIT2: Not the mention this would make more sense with the "Script Tile" which you have to specify the level for. Though that would have to start from 1 instead of 0, an easy fix.
EDIT3:
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