On the right of the launchpad from Area 3 is a bouncepad. Use it to reach a high-up wall. Ink it and climb it, and the kettle sits on top.
Walkthrough
Collectibles
Sunken Scroll
“
When smoke rises from the seven rings, The [sic] pinkfish will emerge from the sea, devouring all the creatures of the land." -The Book of Madai, chapter 10, verse 10
Location: After reaching Checkpoint 6, drop down the grate and immediately turn around. There will be a small area with the Sunken Scroll crate.
Sardinium
Location: On the second rotating platform, stick to the far left. Ink the wall and swim up. The Sardinium will be found in a crate.
Armor
Octocommander Fortress has 3 pieces of armor to collect.
Armor 1 Location:
Armor 2 Location:
Armor 3 Location:
Crust Bucket Ticket
Location: Underneath the back of the platform with the Octostamp DX. Players can access it by destroying the bumper or by hopping down. It's inside a crate.