I'm hopelessly stuck in Swashbuckling Swamp (which I presume to be L2).
What I did:
I got a key from somewhere that wasn't by any of the bs patras (Maybe from the middle bridge room?) and unlocked the west entrance. Then I proceeded to kill the 2 bs patras for one key each, and while opening one of the "two hatch, one orb" secrets and while opening the bridge on the middle bridge screen, I used the two keys up like this:
-one at the west wing, to get through the opened bridge, past the red bubbles into the blue bubble room where I could have hookshot over only if I opened the red hatch earlier, which I presume I would need the raft for
-one at the east wing to stab a red pyramid and get another key, with stabbing the red pyramid have opened a door in the same room which I can't access yet (maybe a series of bombings starting from a northeast room where I haven't been yet?
Current standings:
I have a key, no L2 dungeon items and have the west entrance opened.
I can't do anything at the northeast entrance.
I think I need the raft, as well as the bow (I bought arrow) because I see yellow hatches and at least 1-2 gohmas. Alas, I don't find any of these items.
I know only 3 entrances: west (initially locked), east, northeast (just one room, I can't do anything with).
Before an F6 retry, I experimented with the locked door at Mountain View, which eventually led to the swamp, to a dock. Is that involved with L2, do I need to get through that "bear home invaded by gleeoks" cave? If so, I need the raft first... But then again, to make the best use of the raft, I'd need the bow first, for one of the raft intersections are opened on a yellow hatch screen...