Propellerland is the twentieth mission of Splatoon 2's single player modeOcto Canyon and is the second mission to have multiple routes to proceed in the mission.
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Location: Once you reach Checkpoint 3 and use the fan in the main area to get to the platform with the launchpad, turn around and spin the propeller once again to move it back up. You will see a red splat-switch. Hit it, and it will unlock a platform behind the launchpad. Walk over past it, and get the Sunken Scroll.
Sardinium
Location: During Checkpoint 3, when you're on the platform with the Gusher, spin the propeller all the way until the platform can't go any further. Then use the gusher to reach the Sardinium.
Armor
Propellerland has 4 pieces of armor to collect.
Armor 1 Location:
To the left of the first Octoball of the level in a large crate
Armor 2 Location:
In a small crate in the invisble platform section
Armor 3 Location:
Plastic wrapped crates behind the destination of the 3rd launch pad.
Armor 4 Location:
Beside final checkpoint in a crate
Crust Bucket Ticket
Location:
found on a platform above the starting area, after opening the first lock box use the propeller inside to get up towards the platform, its best to use bombs from far away at the edge of the propeller platform