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, three 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 whoever 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.

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

Swordfighter:

 * Monkey outfit
 * Link outfit
 * Dunban outfit
 * Zero outfit
 * Chrom outfit
 * Lloyd Irving outfit
 * Black Knight outfit

Gunner:

 * X outfit
 * Proto Man outfit
 * Splatoon outfit
 * K.K. Slider outfit
 * MegaMan.EXE outfit
 * Isabelle outfit
 * Bear outfit
 * Samus Aran outfit

Any Mii Type:

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

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.

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.

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.