I'm actually not opposed to working out the unused arms. I got self-conscious about dumping them all in here because I wasn't sure if anyone would be interested in something so subtle. But I guess I need to take what your signature shouts in big SEGA logo letters to heart! I think what I could do to work out what is and isn't used is to change the pointers of every sprite I know for sure is used to something ridiculous, like a character sprite. Then just go to town putting the characters in as many different situations as possible to make sure I don't see any normal arms, and if not, it should be fairly safe to say what is and isn't unused. Also, regarding Crackers sprites: I actually couldn't get Crackers' mapping/etc. loading SonMapEd, so I resorted to nabbing them off a sprite sheet. Is there a newer/better mapping editor out there that supports Crackers? EDIT: Good catch on the level 0's! I'll check the layout pointer lists in the final when I'm home tonight and see if they're pointing somewhere unique.