OMG!!!!!!
Ever notice those arrows on the floor of the Metal Fortress? Some arrows lead you into a wall with something at the wall you can collect. But, I found a short arrangement of arrows on one of the floors on the 2nd level that just sort of meandered in a weird circle-like shape. I'm not sure why (intermittent reinforcement I'm sure), but I decided to follow the arrows from the first one to the last one. As soon as the party stepped on the last arrow, the party was restored with +999HP, +99MP, +9TP, and 1999 EXP each.
I have no idea if other floor areas (in this, or other dungeons) have something like that, but knowing Indy .... Well, let's just say he's the Greatest TRICKSTER of all Time (GTOAT).

@Lady_JJ I'm curious what you will find re: Kranko. He appears in the Metal Fortress and could be missed if you use an Ocarina to go the the beginning of the Fortress. As for that Magnetic Wrench, I also am wondering if NOT taking it is the answer.
