Jill map codes:

Code (hexadecimal)	What it is		Flags
------------------------------------------------------------
0040			Sky, shade piece	Walkthrough
0041			Sky, shade piece	Walkthrough
0042			Sky, shade piece	Walkthrough
0043			Sky, shade piece	Walkthrough
0044			Sky, shade piece	Walkthrough
0045			Sky, shade piece	Walkthrough
0046			Sky, shade piece	Walkthrough
0047			Sky, shade piece	Walkthrough
0048			Sky			Walkthrough
0049			Short shading		Walkthrough
004A			Sky, shade piece	Walkthrough
00BE			Gem lock		Solid until touched with a gem
012F			Dirt			Solid
013F			Gray gravel		Walkthrough
0168			Grass top on dirt	Solid