Since Sonic 2 is a hot topic again these days I decided to take a look at Sonic 2NA again to see if there might be something that needs looking at. As it turns out, there's still quite a bit that needs a comb over in the ROM and it would be great if we could use what we know now to see what's really going on with this ROM. It's known quite well now that the ROM is padded with various weird garbage ranging from symbols to assembler code but what people seemed to have glanced over is that the ROM also has some sections of weird data used for padding that (at least to my knowledge) never looked at before. drx's disassembly, which he made 10 years a go now, mentioned what some of the contents could be but was left unidentified for other people to take a look at. Currently there are 5 locations in the ROM that contain padded data: 1C318-1FFFF <- weird tile from presumably some other game (I researched this and no other game has this data) 2C292-3FFFF <- leftover level layouts, art for the big ring, level mappings, a full 128 character ascii table, and presumably more mappings and palette data 418A8-4FFFF <- symbol table #1 50A9C-7198F <- symbol table #2, plus some source code for the debug mode module ('edit'), debug object lists, etc, plus other potential stuff E1670-FFFFF <- Toe Jam & Earl REV00 left overs, matches the final ROM at this region. The area I'm interested in is 2C292-3FFFF, since I don't think it's been fully looked into. I decided to look into it and it does seem like it has level mappings about 2C292+C00 in: Is this data different/comparable to anything else that's used? I don't really know anything about how levels are mapped in Sonic 2, so I'm curious if anyone knows what this could be. There's some other mappings in this region as well that haven't been identified.