Can someone help me get this game running at 1600x1200? I don't get this hex stuff, and no other site on the internet talks about custom resolutions.
Old games are complicated to edit the field of vision to use a widescreen resolution, the solution is almost always Vert -
But 1600x1200 should not be hard to obtain with a hex editor, why not try? try changing the resolution "640x480" to "1600x1200" with a hex editor, a resolution "4:3" for a resolution "4:3" can go right, hex basic concepts you find here: http://www.widescreengamingforum.com/forum/viewtopic.php?f=31&t=18809
A great hex editor you will find here: http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm
Do not forget to backup your sonic.exe before trying, doing so requires patience, and this method may not work for the desired resolution, I wish you good luck!