Update 1/1/15: Now displays secret exit doors.
Displays an overlay identifying tiles in WL2, for use in navigating and visualizing glitch rooms.
Red - Solid or unknown
Pink - Breakable
Green - Doors...the tile properties for the doors are:
0x4EDB: Regular door
0x4F3A: Normal exit
0x4F60: Secret exit
Blue - Water
White - Platform
The text in the upper left displays the tile properties of the blocks above, at, and below Wario respectively. The first column is the RAM address where the tile ID can be found. If this is above 0xA000 then it's accessing the RAM banks (where level data is normally kept) - between 0xA000-0xBFFF is bank 2, between 0xC000-0xDFFF is bank 3, and between 0xE000-0xFFFF is bank 4. The second column is the raw tile property.