Downloadable Content

Downloadable Content (also known as DLC) is content that is not in the base game cartridge, and needs to be downloaded via Nintendo eShop or other sites to be available in the game. Currently, four DLC collections have been released.

Patch Updates
Patch Updates make up the majority of downloadable content. They are downloadable content that changes the game's features. Most patches are free to download with a copy of the game. Patch updates can include:
 * Adding new characters, stages, and Mii costumes, usually for free or by making them available to buy.
 * Adding new modes or new features to existing modes.
 * Tweaking character attributes to make them more balanced.
 * Tweaking game physics to create a more enjoyable playing experience.
 * Fixing glitches and bugs.

Mewtwo
Mewtwo appears as a downloadable character that can be downloaded by buying and registering both versions of the game on Club Nintendo. It was released on April 15th for whomever registered him on Club Nintendo, and on April 28th as payable DLC. It is also available as a paid DLC. It costs $3.99 to buy it for one version and $4.99 to buy it for both.

Lucas
Lucas was released as a downloadable character on June 14, 2015. It costs $3.99 to buy him on one version and $4.99 to buy him on both.

Ryu
Ryu was released as a downloadable character on June 14, 2015. It costs $5.99 to buy him and Suzaku Castle on one version and $6.99 to buy them on both.

Roy
Roy was released as a downloadable character on June 14, 2015. It costs $3.99 to buy him on one version and $4.99 to buy him on both.

Cloud
Cloud was announced as a downloadable character on November 12,2015. It is unknown how much Cloud and Midgar costs yet or when he comes out.

Mii Costumes
Mii Fighters have downloadable costumes that will give various outfits. All outfits cost $.75 for one version and $1.15 for both, with the exception of the K.K. Slider outfit, which is free with Patch Update 1.1.0.

Brawler

 * Cat outfit
 * Heihachi outfit
 * Akira outfit
 * Jacky outfit
 * King K. Rool outfit
 * Flying Man outfit
 * Toad outfit
 * Captain Falcon outfit

Swordfighter

 * Monkey outfit
 * Link outfit
 * Dunban outfit
 * Zero outfit
 * Chrom outfit
 * Lloyd Irving outfit
 * Black Knight outfit
 * Viridi outfit
 * Hunter outfit (from Monster Hunter 4)
 * Rathalos outfit

Gunner

 * X outfit
 * Proto Man outfit
 * Inkling outfit
 * K.K. Slider outfit
 * MegaMan.EXE outfit
 * Isabelle outfit
 * Bear outfit
 * Samus Aran outfit
 * Fox McCloud outfit

Any Type

 * Smash Bros. T-Shirt
 * Majora's Mask headgear
 * Splatoon squid hat
 * Smash Bros. hoodie
 * Business suit

Miiverse
Miiverse was released on June 14, 2015, free with a patch update.

Suzaku Castle
Suzaku Castle was released alongside Ryu on June 14, 2015 as Ryu's home stage. It and Ryu cost $5.99 for one version and $6.99 for both.

Midgar
Midgar will be released alongside Cloud. It is unknown how much it will cost or when will it come out.

SSB64 Stages
Three stages from the original Super Smash Bros. were released for both versions. These are Dream Land, Hyrule Castle, and Peach's Castle. The backgrounds retain the same graphics, with the only difference being the characters.

Dream Land was released on June 14, 2015, costing $1.99 for one version and $2.99 for both.

Hyrule Castle and Peach's Castle were released on July 31, 2015. Each stage costs $1.99 for one version and $2.99 for both.

Super Mario Maker
Super Mario Maker was released on September 30, 2015. It costs $2.49 for one version and $3.49 for both versions. A hand will create the stage before gameplay starts, and the layout will always be different.

Pirate Ship
Pirate Ship from Super Smash Bros. Brawl was released for the Wii U version on September 30, 2015. It costs $1.99.

Duck Hunt
An unlockable stage on the Wii U version, Duck Hunt was released for the 3DS version on September 30, 2015. It can be downloaded for free.

Modes

 * Tourney Mode was released for free on July 31, 2015. Tournaments can now be organized via Wi-Fi.
 * A function was added on July 31, 2015 which allows Replays to be shared on Youtube.