Super Mario Maker

Costume Mario
 Mario can take on unique forms upon touching a Mystery Mushroom, causing him to transform into Costume Mario. These costumes reference Nintendo and third-party characters, and most of them are easily unlockable by using the amiibo scanning function. There are 153 available costumes in total, 5 of which are from Splatoon.

Using a costume replaces the default sound effects and jingles with Splatoon-themed ones:
 * Mystery Mushrooms: turning into a Splatoon costume adds the spawning sound effect at the end of the regular powerup jingle.
 * Movement: ducking, jumping and landing play different splashing sounds.
 * Appeal: posing with the costumes triggers relevant sound effects. The Inkling Squid, Inkling Boy and Inkling Girl use "This Way!" voice clips, while the Squid Sisters use their respective "Stay fresh!" voice clips.
 * Lose a Life: losing a life with any of the costumes plays Hero Mode - SPLAT! from Octo Valley. It is interesting to note that the Inkling Squid, Inkling Boy and Inkling Girl's fail jingles make use of the "splatted" voice clips, while Callie and Marie don't.
 * Course Clear: completing a level with an Inkling costume plays Hero Mode - Onward! from Octo Valley, while completing a level with one of the Squid Sisters costumes plays the City of Color jingle.

Inkling Squid
The Inkling Squid is the 62nd costume. He is unlocked by clearing a 100 Mario Challenge on Normal or harder, or by scanning the Inkling Squid amiibo. Pressing Up on the D-Pad makes him pose, revealing his humanoid appearance. The Inkling Squid in humanoid form appears to be dark-skinned with green eyes, and he is wielding a Splat Roller and wearing the Studio Headphones, White Layered LS and Hunter Hi-Tops.

Inkling Boy
The Inkling Boy is the 63rd costume. He is unlocked by clearing a 100 Mario Challenge on Expert or Super Expert, or by scanning the Inkling Boy amiibo. Pressing Up on the D-Pad makes him pose with a Splattershot. His appearance is identical to the Inkling Boy amiibo.

Inkling Girl
The Inkling Girl is the 64th costume. She is unlocked by clearing a 100 Mario Challenge on Expert or Super Expert, or by scanning the Inkling Girl amiibo. Pressing Up on the D-Pad makes her pose with a Splat Charger. Her appearance is identical to the Inkling Girl amiibo, spare the charger in place of the usual Splattershot.

Callie
Callie is the 152nd costume. She is unlocked by clearing the Squid Sisters vs. Bloopers Event Course as Callie, or by scanning her amiibo. Pressing Up on the D-Pad makes her strike her signature pose seen at the end of the Inkopolis News, as well as in various promotional artwork. Her unique squid form is also visible when crouching or swimming by pressing Down on the D-Pad.

Marie
Marie is the 153rd costume and therefore the last one. She is unlocked by clearing the Squid Sisters vs. Bloopers Event Course, this time as Marie, or by scanning her amiibo. Pressing Up on the D-Pad makes her strike her matching signature pose. Just like Callie, crouching and swimming reveal her unique squid form.

Squid Sisters vs. Bloopers
"Urgent report from the Squid Research Lab! The Squid Sisters have been spotted in the world of Super Mario Maker, and the local squids don’t seem to be giving them a very warm welcome! It’s up to Callie and Marie to show those Blooper bullies that the new squids on the block aren’t about to be messed with. May the freshest squid win!"

- Description of the course

Squid Sisters vs. Bloopers is the Event Course giving players the opportunity to unlock the Callie or Marie costumes. It was released on July 7, 2016.

Gameplay
The player begins in a small room containing two green doors, each a different route. On the left is Callie's route, and on the right is Marie's route; these can be played in either order. After choosing a door, the player will enter another small room containing the [https://www.mariowiki.com/%3F_Block ? Block] from which the Mystery Mushroom allowing them to transform into Callie or Marie will spawn after being hit.

After entering the Warp Pipe located in the Mystery Mushroom room, the player will find themselves in an underwater area, which is ironic considering Inklings dissolve in water. Leaving through the Warp Pipe at the end sends the player to a non-submerged area similar to the starter rooms. After a bit of platforming, the player can hop on a Lakitu's Cloud and collect coins on the way until the Goal Pole comes into view. As implied by the name of the course, both areas are filled with Bloopers who try to attack the player.

Design
This level uses the [https://www.mariowiki.com/Super_Mario_Bros. Super Mario Bros.] tileset and is designed to evoke the Splatoon universe. The two routes are different but appear extremely similar. The underwater areas feature both a wall and a cluster of coins in the shape of squid arrows; the underground areas feature several of these, in addition to a regular squid shape made out of coins and empty space between blocks.

There is block art of the Firefin logo right before the Goal Pole. The logo's lineart is made out of indestructible blocks, the white parts are made out of Cloud Blocks, and the body is made out of '''? Blocks'''.

Unused gear icons
Gear icons from an unknown prerelease version of Splatoon were present in the game's files. 23 pieces of headgear, 19 pieces of clothing and 12 pairs of shoes were found in total. A majority of the items are recognizable, but a couple of the sprites use sample textures. Others seem to have been either scrapped early on, or possibly repurposed. The Warrior Headdress, the Varsity Hoodie and the Shirtstravaganza are notable scrapped elements.

Debug/test icons
The following pieces of gear are textureless or feature sample text on them, and therefore are listed separately.