Spongy Observatory

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#22: Splat-Switch Revolution
Octo Valley missions
#24: Pinwheel Power Plant

Spongy Observatory
~ More Ink, Less Shrink! ~ (NA)
- Don't Shrink! Don't Flinch! - (EU/OC)
Number 23
Area 5
Sheldon's Request
Items 1 scroll, 1 armor, 2 Inkzookas
Music Cephaloparade
amiibo challenges Inkling GirlInkling Girl (recolor)Inkling Girl 2 Cash 1800

Inkling SquidInkling Squid (recolor)Inkling Squid 2 Cash 1800

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Spongy Observatory

Spongy Observatory is the twenty-third mission available in single-player Octo Valley. The mission is named as such because of its heavy use of sponges.

Octo Valley

Starting in the entry of Area 5, Head to the right, use the entryway, but it is blocked off by a grate, in which Agent 3 can simply clip through it in Squid form. There is a Propeller-Lift. Use it and get up the wall it stops at. Now get up the grate slope. There is an Inkrail but do not take it. There is a wall behind the Inkrail. Using the wall, there are two dry sponges. Use the sponges, and get up the small wall.



Spongy Observatory Stats
Area Enemies Armor Special Weapon Sunken Scroll
Beginning Area N/A N/A N/A N/A
Checkpoint 1 2x Octostamps N/A N/A N/A
Checkpoint 2 1x Twintacle Octotrooper N/A N/A Yes
Checkpoint 3 4x Octotroopers
1x Twintacle Octotrooper
N/A 1x Inkzooka N/A
Checkpoint 4 1x Octobomber 1x Piece of armor N/A N/A
Checkpoint 5 2x Octobombers N/A N/A N/A
Checkpoint 6 2x Octobombers N/A N/A N/A
Checkpoint 7 N/A N/A N/A N/A
Final Checkpoint 2x Octolings N/A 1x Inkzooka N/A


Starting mission 23, there is a balloon fish, which can wet the four sponges, getting Agent 3 to another checkpoint.

Checkpoint 1

There are two Octostamps to fight off. They're standing in sponges, so if they do attack, they will shrink the sponge. Splat both of the Octostamps to reveal a Launchpad.

Checkpoint 2

An Octotrooper guards a platform which to get across, Agent 3 has to go through two sponges. If the Octotrooper starts shooting, the sponge will shrink. Be careful of staying up on the sponges to get across. Throw a Splat Bomb to the Octotrooper and it will stop bothering Agent 3 from getting across.

Checkpoint 3

After wetting the two sponges to get to the next platform, Agent 3's is going to have to get across a sponge alley, guarded by five Octotroopers. There is an Inkzooka to help get across easier. Not using the Inkzooka can be challenging, due to enemy ink shrinking a wet sponge. If chosen to not use the Inkzooka, take out the Octotroopers to make it easier, but be cautious they can shoot it at a high fire rate, making a wet sponge shrink faster.

Checkpoint 4

Another Balloon Fish can be used. There are also three crates on the right, one crate holds armor. Still going, another Balloon Fish can be found, and also an Octobomber. Take out the Octobomber, so that it will not shrink the sponges.

Checkpoint 5

Yet another Balloon Fish can be found wetting four sponges, it can also be used to take out the two Octobombers. Wet two more sponges to go to the next checkpoint.

Checkpoint 6

Using another Balloon Fish, Agent 3 has to make their way up on the mission but will meet about 2 Octobombers. One is just flying around but will chuck a Splat Bomb if found, and one guarding an area, which can shrink a sponge if caught, toss a Splat Bomb at the sponge. Once Agent 3 passes them, the mission continues.

Checkpoint 7

Wet the sponge and get on it. Start putting ink on the wall to swim down and reach the Launchpad. It is also possible without putting ink on the wall, just perform a swimming squid jump off the sponge, and face toward the wall while still in Squid Form, Agent 3 will automatically activate the Launchpad, going into the final checkpoint.

Final checkpoint

A small crate holds an Inkzooka, going into the area will trigger an Octoling fight. Using the Inkzooka, Agent 3 can Insta-splat the two Octolings. Once both of the Octolings are defeated, a Launchpad will appear. Take it to get the Zapfish.


Sunken Scroll

The customary chorus of Calamari County. Nowadays, this song and dance may as well be carved into the very DNA of all Inklings. It began as a way to celebrate and show respect for the bounty of the sea.

Location: At the first checkpoint underneath the starting platform. Upon reaching this checkpoint, proceed to the sponge, but do not inflate it. Look down past it to find two lower sponges. Inflate one of them and jump on it. From squid form, jump off of it onto the platform under the one that holds the checkpoint to receive the scroll.


Location of Armor:

Special Weapon

Location of Inkzooka 1:

Location of Inkzooka 2:

Enemies and mechanics

Previously introduced


Agent 1's Quotes

Agent 1
Sponges! Watch for shrinkage...
Agent 1
Agent 1
An Inkzooka! Nice.
Agent 1
Whoa! Watch out for that one!
Agent 1
Watch your step here!
Agent 1
Yippee! We found the Zapfish Zapfish!
Agent 1
Another Octoling!

Agent 2's Quotes

Agent 2
Just shoot the sponges! What could go wrong?
Agent 2
Easy does it now...
Agent 2
That's the ticket!
Agent 2
Bombs incoming!
Agent 2
Don't let your guard down, now.
Agent 2
Lookin' good, Agent 3!


Names in other languages

Language Name Meaning
Japan Japanese スポンジだらけ展望台
~縮むなひるむな! キモッタマ~

Suponji Darake no Tenbōdai
Chijimuna Hirumuna! Kimottama
An Observatory Full of Sponges:
Don't Shrink, Don't Flinch! My Nerve
Canada French (NOA) - Observatoire spongieux -
Percée en terrain poreux
- Spongy observatory -
Breakthrough in porous terrain
France French (NOE) - Observatoire spongieux -
Percée en terrain porceux
- Spongy observatory -
Breakthrough in porous terrain
Germany German Schwämme im Kreuzfeuer Sponges in the Crossfire
Italy Italian Percorso ad alto tasso
di spugnosità!
Route with a high level
of sponginess!
Mexico Spanish (NOA) Observatorio esponjoso
~ ¡Que nadie se achique! ~
Spongy observatory
~ Let no one shrink! ~
Spain Spanish (NOE) La peligrosa ruta
de la esponja
The dangerous route
of the sponge