Easter eggs

Easter eggs are secrets in video games as a means of unexpected entertainment or a bonus.

The following is a list of easter eggs in Splatoon.

Great Zapfish at Piranha Pit
While playing on Piranha Pit, the Great Zapfish appears briefly out of the water on the far, lower west part of the map. If a player waits until there is one minute left, they will likely see the Great Zapfish. An E-liter 3K Scope scope is recommended for this, to get a closer view in zooming.

Basketball
On the Shooting Range that can be accessed by pressing on the Equipment screen or whilst in Ammo Knights, there is a basketball hoop. If the player tosses a Splat Bomb, into the hoop, their Inkling will say a celebration phrase, much like they would if they were to splat an opponent in Turf War. A green sparkling effect will also occur around the hoop.

Blooper and Octorok
Hidden in various areas of Octo Valley such as Area 4 are stickers featuring the sprites of a cephalopod-like enemy from another Nintendo series. For example, a Blooper from the Super Mario Bros. series and the Octorok from Zelda II: The Adventure of Link, the former being squid-like and the latter being similar to an octopus.

Password entry
Each number on the password entry screen for Private Battles plays a specific tone when the cursor is moved to it. The corresponding notes and numbers are listed below:

These tones are not arranged in order or in a scale, as one would think, but are a bit more arbitrarily placed. It is possible to play the intro to [[Media:Octo Valley Calamari Inkantation.ogg|Calamari Inkantation / シオカラ節]] by moving the cursor between numbers in a specific pattern, which might explain the way the notes are arranged.

The pattern is as follows, each row corresponding to a bar of music: 7 6 7 6 7 6 7 6 5 6 7 6 7 6 7 2 3 8 7 6 7 6 7 6 7 6 5 6 7 2 3 8 3 2 7 2 3 8 9 8 3 2 7 6 7

Sunken Scroll flipbook
Each Sunken Scroll has a doodle of a Character on the bottom right corner. By quickly moving through the pages, one can see a flipbook-like animation showing the character spin around twice and turn into a different one. It starts as a Zapfish, then changes into Judd, and finally, into Sheldon.

Squid Sisters wave
To the left of the Battle Dojo in the elevated walkway to the right of Inkopolis Plaza, there is a studio where the Squid Sisters can be seen chatting. By staying near the window, the sisters will eventually wave at the player. Using the first person view with allows one to zoom in on the scene.

Dumpster Zapfish
There is a stuffed Zapfish in the open dumpster behind Cap'n Cuttlefish's manhole in Inkopolis Plaza. Stuffed Zapfishes are used when the real Zapfish for the level have already been collected by Agent 3.

Mysterious Noise in Boss Arenas
After some boss battles, if a player listens long enough, a sound file containing many mysterious and disturbing noises, including steel banging and assorted, distorted screams, will begin playing. Not even Splatoon's director, Tsubasa Sakaguchi, was not aware of these disturbing noises until an interviewer brought it to his attention. https://www.youtube.com/watch?v=oHDx3vFLxlI

The mysterious noise won't occur after killing the boss in The Ravenous Octomaw! in Area 4 in Splatoon. These sounds still play in the amiibo Boss battle challenges.