Unwelcome Flying Object
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~ Underpass Infiltration ~
Number | 21 |
Area | 4 |
Items | 1 scroll, 2 armor, 1 Bomb Rush, 1 Inkzooka |
Music | Inkstrike Shuffle |
amiibo challenges | ![]() ![]() ![]() ![]() ![]() ![]() |
Unwelcome Flying Object is the twenty-first mission available in single-player Octo Valley. It takes place in a modified version of Urchin Underpass, a multiplayer stage.
Octo Valley
Mission 21 can be found on the tower further away from the entry of Area 4. There are two ways of getting to Mission 21:
Option 1: Head to the tower on the right, there should be a geyser underneath the tower and an Inkrail when taken the Gusher. Activate it and fall down the hole. Agent 3 will be placed to where Mission 19 is located, and there is a Propeller-Lift to take. Use the Propeller-Lift and it will take Agent 3 to a long cube platform with an Inkrail installed. Use the Inkrail and it will take Agent 3 above Mission 21. Slip through the grate in squid form and Agent 3 will find the kettle to Mission 21.
Option 2: There is a shortcut that can be taken underneath Area #4, when close to Mission 16, perform a swimming squid jump to the long cube platform. Use the Inkrail on the cube and it will place Agent 3 above mission 21. Slip through the grate in squid form and Agent 3 will find Mission 21.
Stage summary
Enemies | |||
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Enemy name | Image | Locations and total found | |
Octocopter | ![]() |
Beginning Area Checkpoint 1 |
1 3 |
Octodiver | ![]() |
Beginning Area | 3 |
Octoball | ![]() |
Checkpoint 1 | 2 |
Octotrooper | ![]() |
Checkpoint 1 Checkpoint 2 UFO Base |
2 2 12 |
Twintacle Octotrooper | ![]() |
Checkpoint 1 Checkpoint 2 |
2 2 |
Octobomber | ![]() |
Checkpoint 2 | 3 |
Octostriker | ![]() |
UFO Base | 1 |
Items | |||
Item name | Image | Locations and total found | |
Armor | ![]() |
Beginning Area | 1 |
Canned special | ![]() |
Checkpoint 1 Checkpoint 2 |
1 1 |
Sunken Scroll | ![]() |
Checkpoint 2 | 1 |
Features | |||
Feature name | Image | Locations and total found | |
Sponge | ![]() |
Checkpoint 2 | 2 |
Launchpad | ![]() |
Checkpoint 2 | 1 |
Inkrail | ![]() |
UFO Base | 1 |
Agent 3 must travel through Urchin Underpass while fighting various Octarians and avoiding the Octostriker's attacks. At the end of the stage there is a launchpad going up to the UFO, where Agent 3 faces the Octostriker.
Collectibles
Sunken Scroll

“ | What is this? It looks like the proprietor of that shoe shop! Could there have been an ancient creature that consumed prawns as food?! A terrifying thought indeed... | ” |
— Sunken Scroll 21
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Location: At the Northeastern part of the map at the end of a side path. Go through the level normally until you reach the checkpoint just after the central area of the map. Take a right through the wired fence and continue down that path. Defeat the Octarian along it and grab the scroll.
Armor

Location of Armor 1:

Location of Armor 2:
Special Weapons

Location of Inkzooka:
Quotes
Agent 1's Quotes
Gallery
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Level icon
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In-game map
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Checkpoint 1-Enemy Octodiver Close-up
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Checkpoint 3-Enemy Octobomber
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Checkpoint 3-Enemy Twintacle Octotroopers
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Giant Octarian UFO
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Mission End
Trivia
- Even after the changes made to Urchin Underpass in Version 2.0.0, the map's layout for the mission remained the same as the old version.
Names in other languages
Language | Name | Meaning |
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ほんとにUFOは実在した! ~追跡! デカライン高架下~ Honto ni Yūfō wa Jitsuzai Shita! Tsuiseki! Dekarain Kōkashita |
UFOs are Realy Existent!: Pursuit! Urchin Underpass | |
- Passage Turbot - Tenace, la menace ! |
- Urchin Underpass - Tenacious, the menace ! | |
Unschönes Flugobjekt über der Dekabahnstation |
Unpleasant flying object over Urchin Underpass | |
Essi imbrattano: attacco alieno alla città! |
They stain:[1] alien attack on the city! | |
Objeto volador fastidioso ~ ¡Avistamiento en el parque! ~ |
Bothersome Flying Object ~ Sighting in the park! ~ | |
¡El ovni contraataca! Amenaza bajo el viaducto |
The UFO counterattacks! Threat under the viaduct |