I haven't found a collision viewer anywhere, so I deducted that one should be made. Sonic Collision Viewer (aka SCV) is a program that allows you to see the structure of collision boxes in Sonic games, so you'll be able to assign collision indexes easily to new 16x16 block mappings. The idea of making this program came after a chat with Yuski the Dog. He, like me, was complaining about the lack of a collision viewer for Sonic games. At the first time, I really hadn't any idea how I could make such program. After finding out that a bunch of TextBoxes was a stupid idea, I worked hard on trying to get the PictureBox to do something. Fortunatelly, I learned how to use the PaintPicture method, and then the dream of the collision viewer was coming true. EDIT: newest version uploaded http://geocities.yahoo.com.br/erikjs_br/scv1.0.3.zip Special thanks to Esrael, Nemesis and JoseTheBest. And Yuski.