Well you know that small room with door "D"? which comes from the 'hidden' door in the last big room with the goal? At the bottom, see those coins with a 'gap' and a white letter D? Well further left, there's another gap, with another door (which I should label "E"). The room inside is directly the opposite of "D", in the sense that everything is swapped from left to right, i.e. the 6 coins are now on the right, and the door is on the left. This is why I sometimes think we need some king of thing so we can see all the rooms in the game, like an editor, because there's bound to be parts we've missed. For example in the 1st stage, Captain Drake missed a small part of the level in the 2nd room with doors "A" "B" and "D" and the mouse at the beginning, at both ends where the coins are outside of the 'room', there's a part that you can pound and access more coins below. The part you pound is one 'block' from the edge (the far edge that is), and you come up via small platforms which you then need to break through the floor nearer the 'opening'. Another example is in the 3rd level. In the 3rd room, entered via room "B", with the 6 big coins above the ceiling, there's a part where you need to duck-jump to fit through a small gap, to the right. I think those are the only parts I can see that are missing.
