In the final S2 ROM, the boss machines tiles order is like this: [83BF6] S2 standard eggman ship  CPZ boss [8507C] EHZ boss [8595C] HTZ boss  ARZ boss [86B6E] MCZ boss [87AAC] CNZ boss [882D6] OOZ boss [88DA6] MZ boss (little eggman ship) [8E138] WFZ boss [8BE12] Evil Sonic [8F024] The Great Eggman Now, Chemical Plant's boss is first. I don't know how it is in the Beta, but I think ICEknight or someone else knows this already. Looking how close Emerald Hill and Hill Top are. I would guess that Hidden Palace would go between them if it had a boss. Mystic Cave is the big question. Even in the late Beta scans, the name of the zone is Dust Hill. isn't Mystic Cave finished in our Beta? Have Dust Hill ever been playable? How about trying to see how the tiles were implented in the ROM, and then maybe know a little more about the dev process?