Amiibo

amiibo are figurines produced by Nintendo that are equipped with Near-Field Communication technology and can be used in a variety of games.

Splatoon
On April 1, 2015, Nintendo announced in a Nintendo Direct that Splatoon would be receiving three different amiibo on May 29, 2015. These amiibo, when scanned in Inkopolis Plaza, unlock twenty different challenges with five unlockable boss challenges in Hero Mode and new exclusive accessories to wear into battle. The three amiibo that have been announced are the Inkling Boy amiibo, the Inkling Girl amiibo, and the Inkling Squid amiibo with the latter only purchasable exclusively in the three-pack in North America, and in Europe exclusively in the Splatoon + Inkling Squid amiibo bundle.

Gameplay
The amiibo case is located at the southeastern corner of Inkopolis and it appears as the packaging amiibo traditionally come in. When scanning an amiibo (if the amiibo is registered) a flurry of paint circles the inside as the corresponding amiibo forms inside of it. The character introduces themselves and lays down guidelines for their challenges.

Each amiibo features twenty challenges if the single-player, Octo Valley, has been completed. The first challenge gives the player six hundred cash as a reward, with the reward increasing by one hundred more cash for each next challenge (i.e. one mission reward is 1000 cash, while the next mission reward is 1100 cash). Each challenge can be completed again, though for only a reward of 100 cash. When three challenges in the same row are completed, the fourth challenge for that set is unlocked, being the boss for its corresponding area in Octo Valley. As opposed to a monetary reward, the boss challenges provide three pieces of gear for the first three bosses, a minigame for the fourth, and a weapon blueprint for the final boss.

Inkling Boy
"Sup, playa?! Thanks a ton for callin' me up! I heard you've been makin' waves around the city. And I've got an inkling that you're the type of Inkling who's up for a challenge. Wanna give one of my roller challenges a go? I heard you've been doing work in Octo Valley. Wearin' that crazy getup, wreckin' Octobros and junk! That's when I knew for sure that you've got what it takes to try my challenges. All you gotta do is beat those same missions using a roller weapon! So are you game? I've got some dope rewards lined up if you can pull it off!"

- Inkling Boy

The Inkling Boy amiibo was released on May 29, 2015 along with Splatoon. It can be used to unlock 20 Roller challenges in Hero Mode and will provide the player with an exclusive character piece after every four challenges completed. After completing all challenges, the player will complete the set and receive the exclusive Samurai outfit. It can be purchased separately, or in a pack of three with the Inkling Girl amiibo and the Inkling Squid amiibo in North America.

Challenges
These Hero Mode challenges must be completed with the Splat Roller:


 * 1. Octotrooper Hideout - Reward: 600 Cash
 * 2. Lair of the Octoballs - Reward: 700 Cash
 * 3. Rise of the Octocopters - Reward: 800 Cash
 * Boss:The Mighty Octostomp! - Reward: Samurai Helmet
 * 4. Gusher Gauntlet - Reward: 900 Cash
 * 8. Octoling Invasion - Reward: 1000 Cash
 * 9. Unidentified Flying Object - Reward: 1100 Cash
 * Boss: The Dreaded Octonozzle! - Reward: Samurai Jacket
 * 10. Inkrail Skyscape - Reward: 1200 Cash
 * 11. Inkvisible Avenues - Reward: 1300 Cash
 * 12. Flooder Junkyard - Reward: 1400 Cash
 * Boss: The Rampaging Octowhirl! - Reward: Samurai Shoes
 * 18. Spinning Spreaders - Reward: 1500 Cash
 * 19. Tumbling Splatforms - Reward: 1600 Cash
 * 21. Unwelcome Flying Object - Reward: 1700 Cash
 * Boss: The Ravenous Octomaw! - Reward: Squid Racer
 * 22. Splat-Switch Revolution - Reward: 1800 Cash
 * 24. Pinwheel Power Plant - Reward: 1900 Cash
 * 26. Octoling Onslaught - Reward: 2000 Cash
 * Boss: Enter the Octobot King! - Reward: Hero Roller Replica Blueprints

Inkling Girl
The Inkling Girl amiibo was released on May 29, 2015 alongside Splatoon. It can be used to unlock 20 Charger challenges in Octo Valley and rewards the player with an exclusive costume piece for every four challenges completed. After completing all challenges, the player will complete the set and receive the exclusive School Girl outfit. It can be purchased separately, or in a pack of three with the Inkling Boy amiibo and the Inkling Squid amiibo in North America.

Challenges
These Hero Mode challenges must be completed with the Splat Charger:


 * 1. Octotrooper Hideout - Reward: 600 Cash
 * 2. Lair of the Octoballs - Reward: 700 Cash
 * 3. Rise of the Octocopters - Reward: 800 Cash
 * Boss: The Mighty Octostomp! - Reward: Squid Hairclip
 * 5. Floating Sponge Garden - Reward: 900 Cash
 * 6. Propeller Lift Playground - Reward: 1000 Cash
 * 7. Spreader Splatfest - Reward: 1100 Cash
 * Boss: The Dreaded Octonozzle! - Reward: School Uniform
 * 13. Shifting Splatforms - Reward: 1200 Cash
 * 14. Octoling Assault - Reward: 1300 Cash
 * 15. Undeniable Flying Object - 1400 Cash
 * Boss: The Rampaging Octowhirl! - Reward: School Shoes
 * 16. Propeller-Lift Fortress - 1500 Cash
 * 17. Octosniper Ramparts - 1600 Cash
 * 20. Octoling Uprising - 1700 Cash
 * Boss: The Ravenous Octomaw! - Reward: Squidball
 * 23. Spongy Observatory - 1800 Cash
 * 25. Far-Flung Flooders - 1900 Cash
 * 27. Unavoidable Flying Object - 2000 Cash
 * Boss: Enter the Octobot King! - Reward: Hero Charger Replica Blueprints

Inkling Squid
The Inkling Squid amiibo was released on May 29, 2015. It can be used to unlock 20 Kraken and limited-Ink challenges, and shooter challenges in Hero Mode and will provide the player with an exclusive costume piece after every four challenges completed. After completing all the challenges, the player will complete the set and receive the exclusive Mech outfit. It is available exclusively for purchase in a pack of three with the Inkling Boy amiibo and the Inkling Girl amiibo in North America, and exclusively in a bundle with the main game in Europe.

Challenges
In the Kraken Challenges, the player must complete the level in a certain amount of time. However, the player is also given the ability to turn into a Kraken instead of a Squid for the entirety of the level. The challenges are as follows:
 * 1. Octotrooper Hideout - Reward: 600 Cash
 * 2. Lair of the Octoballs - Reward: 700 Cash
 * 3. Rise of the Octocopters - Reward: 800 Cash
 * Boss: The Mighty Octostomp! - Reward: Power Mask
 * 7. Spreader Splatfest - Reward: 1100 Cash
 * Boss: The Dreaded Octonozzle! - Reward: Power Armor
 * 12. Flooder Junkyard - Reward: 1300 Cash
 * 13. Shifting Splatforms - Reward: 1400 Cash
 * Boss. The Rampaging Octowhirl! - Reward: Power Boots
 * 18. Spinning Spreaders - Reward: 1500 Cash
 * 19. Tumbling Splatforms - Reward: 1600 Cash
 * 20. Octoling Uprising - Reward: 1700 Cash
 * Boss: The Ravenous Octomaw! - Reward: Squid Beatz
 * 24. Pinwheel Power Plant - Reward: 1900 Cash
 * 25. Far-Flung Flooders - Reward: 2000 Cash
 * Boss: Enter the Octobot King! - Reward: Hero Shot Replica Blueprints

In Limited Ink Challenges, the player is given three full tanks of Ink and must complete the level with that. Ink will not refill by swimming and the level will end the moment the last shot is fired. The challenges are as follows:
 * 4. Gusher Gauntlet - Reward: 900 Cash
 * 5. Floating Sponge Garden - Reward: 1000 Cash
 * 11. Inkvisible Avenues - Reward: 1200 Cash
 * 23. Spongy Observatory - Reward: 1800 Cash

Trivia

 * The Inkopolis Plaza out of bounds glitch reveals that the back of the amiibo case at the southeastern corner does have a texture and looks like the back of real amiibo packaging, except the words are written in Inkling.