To get the Octo Chart, blow up all the cannons in D-4: Six-Eye Reef. Pick up Treasure Chart #26, then travel to D-3: Northern Triangle Island to get the Octo Chart. This chart lists the locations of ...

Strategy for Bigocto: One method is to chase Bigocto around the circular room (being careful not to touch the spikes on the sides of the middle platform) and once you get close enough behind him, ...