Ahh, Wonderswan hacking... I gave it a go a couple of months ago. I didn\'t do much, but I did get some results in hacking the graphics. Tile Layer Pro (download HERE) is able to edit the graphics from Wonderswan regular and color ROMs. For color games like you want to do, open the WS ROM in the editor. Then, in the menu View, select the option Format. Depending of the ROM you are editing, choose either SMS or Genesis, until you see some graphics appearing somewhere in the ROM. You might need to hit + or - a couple of times to make sure the tiles are centered. You can then work from there to edit any of the graphics from the game.
I know this isn\'t much, but... better than nothing, no?
[Edited on 4-8-2002 by Dr. Cossack]