Splatoon 2 (Switch)

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Callie & Marie Amiibo

By scanning the Callie & Marie Amiibo, you can unlock the Hero Replica Outfit and Armor Replica Outfit, respectively. However, you must complete Single Player mode first to unlock their respective gear sets.

ItemLocation
Armor Boot ReplicaComplete the Single Player campaign, then scan the Marie amiibo.
Armor Helmet ReplicaComplete the Single Player campaign, then scan the Marie amiibo.
Armor Jacket ReplicaComplete the Single Player campaign, then scan the Marie amiibo.
Hero Headset ReplicaComplete the Single Player campaign, then scan the Callie amiibo.
Hero Jacket ReplicaComplete the Single Player campaign, then scan the Callie amiibo.
Hero Runner ReplicaComplete the Single Player campaign, then scan the Callie amiibo.

Credits TV

After defeating the final boss. Return to Octo Canyon and Marie will put up a TV to view the credits anytime.

Easy EXP/Coin Tickets in Singleplayer

In the Singleplayer, you might be aware that you can find some of these tickets around, although you can't collect them more than once. However, after you fully upgrade all the Hero Weapons, including the Ink Tank and the Bombs, you can purchase one ticket for 1500 Power Eggs.

Gear in Octo Expansion DLC

If you have the Octo Expansion DLC you will be able to unlock the following gear by completing the corresponding task.

Conductor Cap
Get ALL the Mem Cakes in the game.

Golden Toothpick
Beat the secret boss 'Inner Agent 3'.

Neo Octoling Armour
Get ALL the Mem Cakes in 2 Lines.

Neo Octoling Boots
Get ALL the Mem Cakes in 3 Lines.

Null Armour Replica
Get ALL the Mem Cakes in 5 Lines.

Null Boots Replica
Get ALL the Mem Cakes in 6 Lines.

Null Visor Replica
Get ALL the Mem Cakes in 4 Lines.

Octo Shot Replica
Beat the Octo Expansion.

Octoling Shades
Get ALL the Mem Cakes in 1 Line.

Old-Timey Clothes
Get ALL the Mem Cakes in 8 Lines.

Old-Timey Hat
Get ALL the Mem Cakes in 7 Lines.

Old-Timey Shoes
Get ALL the Mem Cakes in 9 Lines.

New Weapons in Octo Canyon

As you play through the Octo Canyon single player mode, you'll unlock new Hero Weapons to use as you progress.

UnlockableHow to unlock
Hero BlasterUnlocked in Lair 19.
Hero BrellaUnlocked in Lair 20.
Hero BrushUnlocked in Lair 22.
Hero ChargerUnlocked in Lair 06.
Hero DualiesUnlocked in Lair 05.
Hero RollerUnlocked in Lair 04.
Hero ShotUnlocked in Lair 01.
Hero SlosherUnlocked in Lair 10.
Hero SplatlingUnlocked in Lair 13.

Online Lobby Remix

When you're waiting to connect to a room when playing online you can press and hold Up or Down on the Left Analaog Stick to change the pitch and tempo of the music, pressing and holding Down on the Right Analog Stick will make the music sound muffled like you're underwater.

Weapons

Many weapons become purchasable from Ammo Knights after reaching certain levels from playing multiplayer.

WeaponHow to unlock
.52 GalReach Level 14
.96 GalReach Level 21
Aerospray MGReach Level 6
Aerospray RGReach Level 28
BlasterReach Level 5
Carbon RollerReach Level 7
Clash BlasterReach Level 30
Custom BlasterReach Level 27
Dapple DualiesReach Level 26
Dynamo RollerReach Level 20
E-Liter 4KReach Level 20
E-Liter 4K ScopeReach Level 30
Enperry Splat DualiesReach Level 11
Firefin Splat ChargerReach Level 16
Firefin SplatterscopeReach Level 25
Flingza RollerReach Level 24
Goo TuberReach Level 22
H-3 NozzlenoseReach Level 29
Heavy SplatlingReach Level 8
Jet SquelcherReach Level 17
Krak-On Splat RollerReach Level 12
L-3 NozzlenoseReach Level 18
Luna BlasterReach Level 19
Mini SplatlingReach Level 23
N-Zap '85Reach Level 9
OctobrushReach Level 10
Rapid BlasterReach Level 13
SlosherReach Level 5
Splash-o-MaticReach Level 25
Splat ChargerReach Level 4
Splat DualiesReach Level 4
Splat RollerReach Level 4
SplatterscopeReach Level 15
SplattershotReach Level 2
Splattershot ProReach Level 10
Tentatek SplattershotReach Level 4
Tri-SlosherReach Level 15