Unidentified Flying Object is the ninth mission available in Splatoon's single-player mode, Octo Valley. It is the first mission with an Octostriker, an Octarian enemy that launches Inkstrikes, and takes place in a modified version of the tutorial area.
After beating The Mighty Octostomp! in Area 1, the player can move on to Area 2 via an Inkrail near the Boss Kettle. This level's Kettle can be found by inking a wall near the left side and then jumping one platform to the one where the kettle is.
*Octocopters respawn during the fight, for a total of 12.
Collectibles
Sunken Scroll
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It seems that some Octarians can assume humanoid form. These specimens have superior physical capabilities and are highly aggressive. High-ranking individuals have kelp on their heads. But what motivates them, if anything at all?
Location: At the third checkpoint, behind the ramp. After hitting the third checkpoint, go to the set of stairs leading to the ramp with grates bridging it and the next platform. Drop through the grates and face the backside of the ramp to collect the Sunken Scroll. It is possible to also go around the ramp without passing through the grate.
Armor
Location: There is a large crate in Checkpoint 2 surrounded in the enemy's ink. Shoot at the crate and the armor will appear.