GCN Mushroom Bridge is a track added in the rom hack that I don’t see on the speedrun.com site as one of the levels.

While there is a track missing from the IL leaderboards, I believe the readme file states that it is 3DS Daisy Hills.

I believe the mod who was mainly in charge of this board is inactive atm (I asked about a week ago why there wasn't any milliseconds for ILs and got no response), so I would assume that is why there are tracks missing from the leaderboard. I know nothing about this rom hack, but there probably needs to be a new mod given that i don't really know what's going on