- This article is about the location. For the mode by the same name, also known as Hero Mode, see Octo Valley (mode).
Octo Valley is a large, outdoor area surrounded by mountainous formations and octopus-shaped rocks. There are several waterfalls in Octo Valley. It is the home base of the Octarians, and is where single-player missions can be accessed. The player can enter Octo Valley via a manhole near the front of Inkopolis Plaza or by tapping "Octo Valley" on . Under Octo Valley is a collection of many large domes, their interior walls covered with screens that display images of the surface. There are 33 Kettles scattered across the valley that will take players into these domes when they go through their grated surfaces in squid form. It has five areas, each connected to each other by Inkrails, except for the fifth area, which has blocks that need to be jumped across. Each level in a area can be completed in any order. Once all levels have been passed, the Boss kettle for each section will open. The boss will need to be defeated to disable the power plug for the force field, which blocks the Inkrail to the next area.
Cap'n Cuttlefish appears to reside in Octo Valley, as players encounter him standing outside a shack decorated with a large map. From here, players assume the role of Agent 3 and join Agents 1 and 2 in locating and defeating the Octarian army. Upon defeating DJ Octavio, he will appear inside a snow globe next to Cap'n Cuttlefish's shack, along with a floating credits board allowing the player to view Splatoon's credits again. When the snow globe is hit with Ink, DJ Octavio will cower and give off a purple glow. Both he and Cap'n Cuttlefish will turn to look at Agent 3 whenever they approach.
Area 1 is on top of a building, and is the smallest area. The entrance to Octo Valley is here, as well as Cap'n Cuttlefish's shack.
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Area 2 appears to be a skatepark. The Boss kettle is on a tower similar to the one at Blackbelly Skatepark.
Area 3 has lots of walls to climb. The boss kettle is at the top. Once the player has got there, there is the front of an Inkrail that takes you to the front of Area 3.
The Inkrail from Area 3 takes the player to a platform with a Propeller Lift, which takes them to the main part of Area 4. It has lots of square holes in the ground, which lead to platforms below. There are several Gushers and Inkrails that take you to different parts of this area.
The final area is a big platform with lots of blocks in the air. There are two ways to get up. On the right hand side there is a grate which goes behind the area and leads to a Propeller lift, taking the player up to the platforms in mid-air. The second way to get up is by an Inkrail near the back. Throughout the stage, there are lots of Sponge Blocks, Propeller lifts, and Inkrails. Once the player gets to the top, they will find the top of an Inkrail that leads to the ground. The final boss kettle is located on a UFO flying above Octo Valley. A Launchpad is found at the highest point in the area, taking the player to it.
- Main article: Octo Valley (mode) - Gameplay
Once the player enters Octo Valley, they can access the Octo Valley mode. From there, they can play 32 different missions (including boss battles) that feature various singleplayer-only mechanics such as Inkrails, Sponge Blocks, and Balloon Fish.
- The official Japanese Splatoon Twitter account stated that Octo Valley "was made using the remains of an ancient civilization. It seems to be using very familiar things... or is it just my imagination?" This seems to hint that Splatoon's events take place on Earth, long after humans have gone extinct.
- In various parts of Octo Valley, it is possible to see Inkopolis off in the distance, as well as a huge rock formation that resembles an octopus.
- Unlike nearly every other area in Splatoon, Octo Valley is not set at night during a Splatfest.
- On the corner of Cap'n Cuttlefish's shack are two small photographs, one of Callie and one of Marie.
- The first area of Octo Valley is on the top of a building.
Agent 3 approaching Cap'n Cuttlefish.
DJ Octavio in a snowglobe.
DJ Octavio's reaction to Agent 3 attacking the snowglobe.
Concept art of Kettles in Octo Valley.
Names in other languages
|Octopus Pot Valley|
|Spanish||Distrito Pulpo||Octopus District|
|Italian||Distretto Polpo||Octopus District|