Wait, wasn't there 4 wily castles in MM7? I remember seeing this, but then I got that image from the "saveprogress" cheat and got in Bass boss and I started to asking myself, why there isn't the wily castles? Like, even if it's a spoiler tell me please, does this have to do with do not using Super Adaptor in Bass? (I know that this way you can unlock Wily Machine, but I don't know if there's something more.MM7DW2-4 used to be part of the campaign, but they were cut from it in later versions of 8BDM. They technically are still in the game, including their campaign info, but said info is now unused.
mm8bdm_saveprogress=1093
On a side note, if you can't get the command to work in game (I wasn't able to but in the past I was) you can go directly to the game's files (albiet a bit more tricky to do).the command works when used in the credits.