Project+


 * For information on Project+'s predecessor, see Project M.

Project+ is a successor to the gameplay modification of the Brawl mod Project M (based on Legacy TE) with the aim to improve the balance among the cast by making small moveset changes to all or most characters. Project+'s development started in 2018 and version v1b was released in April 2019. On March 17, 2020, Project+ 2.0 was revealed with additional content, such as new modes, revamps to some characters movesets such as Bowser getting a new fireball attack and Charizard getting, and the reveal of Knuckles the Echidna as the only new playable character beyond what Project M had.

Shortly after its initial release, Project+ received high levels of popularity among players. By April 8, 2019, Project+ had received 100,000 downloads on its primary site alone. Since its release, Project+ has become the main mod over Project M in several tournaments, most notably and recently, , and , with many majors switching from Project M over to Project+.

Changes from Project M and Legacy TE
Like the mods Project+ was based on, this mod focuses on improving the overall gameplay. While Project+ has many minor changes, these are a handful of the noteworthy ones.

One of the biggest changes, which is the main focus of Project+, is the significant removal of various bugs and memory leaks featured in version 3.6 of Project M. These bugs are universal and pertain to either stages, movesets, alternate costumes, sounds, or previously outdated codes used in Project M. While Project+ still has a few bugs, they no longer impact the overall performance as easily as they did previously, thus reducing crashes and freeing a large amount of memory. Tourney mode, which previously redirected to the Rotation mode due to glitches, is now replaced by a debug mode.

Many more music tracks were also added, bringing the standard to a total of over 500 songs. In addition to the music found in Project M, songs from other games are included as either new arrangements or from their original source. These include songs from Paper Mario and Pokémon Mystery Dungeon, as well as unused tracks in Brawl's files such as "New Age Retro Hippie" from EarthBound. Thanks to the bug fixes and memory expansion, it is now completely possible to add music without replacing songs in the default game.

As mentioned by the development team, most of the changes are merely aesthetic. Noticeably, the character select screen now features a new HUD, matching the theme of Project+, and includes diamond portraits. The names of the character are now completely omitted. All characters have original artwork for their select portraits, with their alternate costumes also sharing the same pose rather than having unique poses per costume, with the exception of Samus, Kirby and Ganondorf, as was the case with Wario's costume in Brawl. Additionally, every fighter now has a standard of 17 costumes, with 15 in the base and two hidden skins accessible by holding R or Z.

Characters
Project+ retains the same roster as Project M, albeit with the addition of Knuckles from the  series. All of the characters received balance changes based on input from the competitive Project M community. Characters previously considered low tier were given better tools to help with their viability while characters previously considered high tier were nerfed to bring them closer to the rest of the cast. Additionally, certain aspects of characters deemed oppressive or frustrating by the community were balanced in an attempt to alleviate such issues while still maintaining the appeal it had to players who had used it.

The mod marks the first time where characters have had their default designs significant revamped, with two of them no longer using their given Brawl designs. The first is (whose design was changed to a combination of her design seen in Metroid Prime and Metroid: Samus Returns), and the second is  (whose design was changed to be similar to her Other M appearance, a concept that was initiallyplanned for Project M). Many characters received a visual overhaul and major touchups to their alternate costumes in Project+: one of them is where his Outset alternate costume was upgraded and given new shirt designs based on charts in The Legend of Zelda: The Wind Waker, and his Linebeck alternate costume receiving the shield design as seen in Phantom Hourglass. The Shiny color schemes of characters like and  now have an aesthetic effect where they sparkle like in the mainline Pokémon games during their respective intros. Lastly, was given major polygon improvements to smooth out his armor and boots as well being given a cleaner and more red hair texture when compared to Project M 3.6's last revision. Roy was given a trophy which he lacked in Brawl while both Mewtwo and Knuckles had their trophy models changed.

Bold denotes characters not in Brawl.

Stages
All stages from Project M 3.6 return. Some remain untouched, while others such as Metal Cavern, Luigi's Mansion and were given new layouts for competitive use. Battlefield and Final Destination have a 4th hidden alternate that accesses their appearances in the 1P Mode of the original Super Smash Bros.

In addition, along with the remaining stages from 64, Melee, and Brawl, 17 new stages have been added; they all have 3 alternate layouts or skins to choose from by holding the button shown on the stage selection screen:


 * Bell Tower - A stage inspired by Generation II of the Pokémon franchise (Gold, Silver, and Crystal) as well as their Generation IV remakes. It is located in the Johto region, more specifically Ecruteak City, where players fight against the city's Gym Leader, Morty. Ho-oh appears in the background and flies in front of the signature Bell Tower, where it must be fought and captured. The stage occurs at sunset, a reference to the title screen of Pokémon HeartGold. Bell Tower has a large platform that periodically shifts to a nearby building below and then back up again. A similar concept for a Gen II Pokémon stage was actually planned for Melee, the Sprout Tower, which appears as an alternative version of the stage by holding the Z Button while selecting it.
 * Ceres Space Colony - A stage based on the same location seen in Super Metroid, which also contains a Metroid in it. It also uses the layout of Norfair seen in Project M.
 * Clock Town - A stage inspired by The Legend of Zelda: Majora's Mask. It is located in the game's central hub, Clock Town. In the background is the signature clock tower located in South Clock Town, where Young Link begins his journey, and behind the tower is the Moon. The stage has a day-night cycle based on the three-day cycle in Majora's Mask, in which the moon draws closer as the time progresses. The cycle lasts for eight minutes, and restarts after it ends; near the end of the cycle, Skull Kid appears and causes the moon to come close to the tower.
 * Cookie Country - A stage inspired by Kirby's Return to Dream Land. It is located in Cookie Country, the first level of the game, specifically the first stage of Cookie Country, where Kirby begins his journey.
 * Dead Line - A stage inspired by Sonic Rush. It is located in Dead Line, the seventh zone for both Sonic and Blaze's stories. It has a swinging platform similar to Green Hill Zone, but has a much larger main platform, and four extra platforms, two on each side of the swinging platform, that periodically move around.
 * Dinosaur Land - Returning from Melee, it is a renamed version of Yoshi's Island (SSBM).
 * Dracula's Castle (not Dracula's Castle of SSBU) - A stage inspired by the Castlevania franchise. It is located in Dracula's Castle, a frequently recurring area in the series, being the lair of the aforementioned Dracula. The version found in this game is specifically based on the castle's appearance in the Dimensional Rift stage of Castlevania Judgment. Originally in Project M, it was removed in 3.6 due to copyright concerns. It features periodically moving platforms similar to Delfino's Secret.
 * Mario Circuit - A returning stage from Brawl.
 * Frigate Husk - A stage replacing Frigate Orpheon.
 * Golden Temple - A stage inspired by Donkey Kong Country Returns. It is located at the Golden Temple, the ninth and final world of the game. It contains two platforms in the middle with one above the other.
 * Green Hill Zone - Visual appearance changed to resemble its appearance in Sonic Generations.
 * Kongo Jungle - Completely remade to match Dream Land, Hyrule Castle and Peach's Castle's similar HD remakes from Project M.
 * Mushroom Kingdom (SSB)
 * Minecart Madness - A stage inspired by the level of the same name from the original Donkey Kong Country, originally intended to appear in Project M.
 * Planet Zebes - A HD reimagining of the N64 stage of the same name, with a new design inspired by the opening area of Metroid: Zero Mission. Holding the X button before choosing the stage will instead load Brinstar.
 * Poké Floats
 * Princess Peach's Castle
 * Rainbow Cruise
 * Sector Z - Completely remade to match Dream Land, Hyrule Castle and Peach's Castle's similar HD remakes from Project M.
 * Sky Sanctuary Zone - A stage inspired by Sonic & Knuckles. It is located on Angel Island, with it being the next zone the player goes to after Hidden Palace Zone. The stage contains two slanted platforms, with the teleporter and signpost from the game appearing in the background. In version 2.4, its visual appearance is changed to resemble its appearance in Sonic Generations.
 * Subspace - A stage inspired by the Great Maze in the Subspace Emissary. It is an amalgamation of the various stages where players must fight Tabuu's puppet fighters. The platforms rotate every few seconds.
 * Temple of Time - A stage inspired based on the Temple of Time's appearance in The Legend of Zelda: Twilight Princess.
 * Venus Lighthouse - A new stage inspired by the Golden Sun franchise. In the first game, the Venus Tower is the final location in Isaac's quest to save Vale; the stage takes place on the very top of the tower, where the game's final boss is located. The tower can be seen breaking open with a gigantic sphere of psynergy, referencing the ending of Golden Sun where the tower has been activated. It closes after a few seconds.
 * Yoshi's Story - Visually redone to better represent how it looks in Melee.
 * WarioWare, Inc. - The stage rewards Turbo mode when succeeding in a microgame like in Project M, and the X button can be held before selecting the stage for Brawl rewards as well.

The alternate layouts include one for Dream Land set in night, one for Yoshi's Story based on Shy Guy's Toy Box from Paper Mario, one for Spear Pillar based on the Ultra Deep Sea area of Pokémon Sun & Moon where the Mother Beast (being Lusamine, the leader of the Aether Foundation, upon being possessed by the Ultra Beast, Nihilego) is fought at the climax of the games, one for Green Hill Zone based on Marble Zone from Sonic the Hedgehog on Sega Genesis, one for Sky Sanctuary Zone based on Chaos Angel from Sonic Advance 3, one for Poké Floats taking place in a blue sky and featuring floats of Pokémon like Kirlia and Gengar, one for Pictochat based on the main screen of Mario Paint, one for Pokémon Stadium 2 based on the area where the Kalos Region's champion, Diantha, is fought at the end of Pokémon X & Y, and one for Hyrule Castle taking place in the castle's courtyard.

Tier List
On January 9, 2022, the first-ever Project+ tier list, coordinated by and, was released. It was created using ballots from the following players:, , , , , , , , , , , , and. Players were asked to rank the cast. Their ballots were then averaged together with outliers removed to avoid having any one ballot dramatically skew any character’s placement. ,, and rose the most on the tier list, with Zero Suit Samus rising to 2nd. ,, and dropped the most. remained ranked 1st, and ranks 7th-9th of, , and stayed the same. ,, and dropped into the bottom tier. made his debut at 10th, at the top of A tier. The tier list scores can be found here. and Peach have equal scores, but Toon Link had a lower score including outliers and had less overall variance.

Errors
Like with Project M due to Project+'s mainly focusing on the competitive aspect of the game, the mod experiences some errors and abnormalities regarding non-competitive aspects:
 * The AI still inherents several of the flaws from Project M, such as air dodging while off stage or aiming their recoveries improperly.
 * In Classic Mode's Character Roll Call shooting sequence, when using either Mewtwo, Roy, or Knuckles, the character selected will be displayed as Mario instead.
 * The congratulations screen for most of the roster is unchanged from Brawl.
 * The high scores for Mewtwo, Roy, or Knuckles in the single player modes and max combos for Training Mode are shared with Lucario, Marth and Sonic respectively.
 * Because, , , and have individual character slots, this can give two players the same palette swap if the corresponding characters transform into each other, without even using the same color glitch.
 * Interestingly, Mewtwo uses many data slots that were originally used for.
 * Clearing Classic Mode with it,, or  will play Pokémon Trainer's "Congratulations" video and Mewtwo's "Congratulations" screen.
 * Any records with any of the four characters are added to Mewtwo's records.
 * The Pokémon Trainer's name is changed to "Mewtwo" except in the Sound Test and his character introduction in The Subspace Emissary.
 * The Sound Test is almost unedited from Brawl.
 * The announcer's voice clips for selecting Mewtwo are missing in the sound test because it uses the unused clip for the Fighting Alloy Team, which isn't present in the Sound Test. Roy's voice clip is present instead (where Pokémon Trainer's voice clip would be).
 * When uses Codec Conversations on,  or  the conversation for  plays.
 * The Subspace Emissary, while playable, contains several glitches and inconsistencies:
 * It is naturally impossible to play as, and  since they can never be met to join the roster.
 * Icons for selecting the characters uses the icons from Brawl.
 * Wario's portrait shows his WarioWare outfit.
 * related glitches:
 * In All-Star Mode, Charizard will be fought with three stocks instead of having Squirtle and Ivysaur.
 * In The Subspace Emissary, Pokémon Trainer (after obtaining all three Pokémon) defaults to, rendering Squirtle and Ivysaur naturally unplayable due to the removal of Pokémon Change.
 * Like with Project M and other mods of Brawl, the game may crash at random, mostly either due to bugs or exceeding the memory limit. This especially happens if items are turned on.
 * During Challenger Approaching events, if the player is using the same character as the one they are trying to "unlock", both the player and AI will have the same palette swap.

Project+ Tournament Addition
Project+ Tournament Addition is an updated version of Project+ that was first released on March 27th, 2022 as a successor to the game. Despite being a successor to the game, it uses Version 2.2 of Project+ as a base. Thus, alterations that were carried over from Version 2.3 onwards (like the costume reworks for characters from The Legend of Zelda, Lucario's Shiny eye color, etc.) don't appear. The following changes were made compared to Project+ in terms of character costumes and stages.


 * Most character artwork is altered, and the menu UI receives a pink coloration.
 * Mario gains a costume based on Flying Mario from Super Mario Galaxy, a costume based on Ice Mario from New Super Mario Bros. Wii, a costume based on White Raccoon Mario (albeit lacking the ears and tail) from New Super Mario Bros. 2, a costume based on the Japanese boxart for Wrecking Crew (albeit with a green hat instead of a red helmet), and a red Builder costume.
 * Luigi gains a brown-and-orange costume, a costume based on Flying Squirrel Luigi from New Super Mario Bros. U, his yellow-and-green costume from SSB4 and Ultimate, a Waluigi-inspired palette for his Mr. L costume, and a yellow palette for his Casino costume.
 * Peach's Daisy-inspired costume receives a graphical overhaul and she gains a costume where she wears the dress of Rosalina, a white-and-cyan palette for her Fire costume, a green-and-white palette for her Fire costume, a green palette for her Sunshine costume that references Queen Merelda from Wario Land: Shake It! (known as Wario Land: The Shake Dimension in British English), and a cyan-and-yellow palette for her Sunshine costume that references the original design of Captain Syrup.
 * Wario gains a cyan-and-purple costume based on a similar alternate costume from Mario Golf, a purple-and-white costume based on his in-game sprite from the NES version of Wario's Woods, his green-and-yellow and red-and-blue Biker costumes from SSB4 and Ultimate, a yellow-and-purple palette for his Tycoon costume that replaces the WarioWare: Snapped! reference with a reference to his default costume, a beige palette for his Tycoon costume, and a pink palette for his Tycoon costume.
 * Yoshi gains a darker pink costume with orange shoes, an alternate costume inspired by Poochy (Yoshi's dog-like friend), his Boshi-inspired costume (which is moved forward from his Z-Alt), an alternate costume inspired by Yoshi Kid from Paper Mario: The Thousand-Year Door (to possibly compliment Peach's costume based on when she's possessed by the Shadow Queen in said game), an alternate costume inspired by Yoob from Mario & Luigi: Partners in Time (who appears in the game as a giant obese Shroob resembling a pink-and-green alien Yoshi), a yellow palette for his Dorrie costume, and a purple palette for his Dorrie costume.
 * Bowser's Dark Bowser-inspired costume is moved forward (from his Z-Alt) and gains a red palette based on Dark Star X from Mario & Luigi: Bowser's Inside Story, a green palette, a black-and-white palette, and a yellow-and-green palette referencing Bowser himself.
 * Donkey Kong's costume that replaces him with Funky Kong (which is moved forward from his R-Alt) and gains a red palette, a blue palette with lighter fur possibly in reference to his appearance in the Donkey Kong Country cartoon, a green palette, and a purple palette.
 * Diddy Kong's Blue Team costume from vBrawl is altered to better resemble his Super Kong counterpart from Donkey Kong Country Returns and gains an alternate costume based on his appearance when clearing a stage in Donkey Kong Country 2: Diddy's Kong Quest (with his Rocketbarrel being replaced by a boom box), alongside a green palette for it, a blue palette for it (which uses the vBrawl Blue Team colors), a yellow palette for it, and a brown palette for it.
 * Captain Falcon gains a red costume (which differs from his Blood Falcon-inspired costume), a black costume that references Phoenix from F-Zero GX (much like a similar Retro costume), a black costume that references Black Shadow, a more superhero-like costume that borrows some design elements from concept art for the original F-Zero (minus the cigar), a red palette for it based on the colors for the Fire Stingray, a green palette for it, a yellow palette for it based on the colors of the uniform worn by Dr. Stewart, and a black palette for it.
 * Fox gains his yellow costume from SSB4 and Ultimate, a new costume based on his appearance in Star Fox: Assault, a red palette for it based on Falco, a green palette for it based on Slippy, a blue palette for it based on Krystal.
 * Falco gains a dark-blue costume, his Star Fox Adventures costume (which is moved forward from his Z-Alt), a red palette for it, a blue palette for it, and a brown-and-green palette for it.
 * Wolf gains his vBrawl Red Team costume, his vBrawl Green Team costume, a yellow costume with beige fur, a purple costume, and a pink palette for his Pilot costume.
 * Link's purple costume is given dark-purple hair to reference Ravio from The Legend of Zelda: A Link Between Worlds and gains an alternate costume based on his appearance in The Legend of Zelda: Breath of the Wild (and by extension, both Ultimate and The Legend of Zelda: Tears of the Kingdom) placed between his default and Ocarina of Time costumes, loses his purple palette for his Ocarina of Time costume, gains his Hyrule Warriors costume (which is moved forward from his R-Alt), a red palette for it that's unlocked from Map 1 (Hyrule Field), a blue palette for it that's unlocked from Map 1 (Hyrule Field), and a purple palette for it based on Ganon's appearance in the game (which itself is unlocked after completing the Rewards Map's "Live out the illustration 'The Giants Gather'!" mission).
 * Toon Link's Dark Link-inspired costume is altered to better resemble Dark Link's appearance in a manga adaptation of The Legend of Zelda: Four Swords Adventures (while also trading positions with his costume based on Link's appearance in The Legend of Zelda) and gains a costume based on the Blue Mail from The Legend of Zelda: A Link to the Past, a costume based on the Red Mail from The Legend of Zelda: A Link to the Past, his gray costume from SSB4 and Ultimate, an orange costume with dark-brown hair, a blue palette for his Linebeck-inspired costume, his Conductor costume (which is moved forward from his R-Alt), a red palette for it, a green palette for it, and a purple palette for it.
 * Zelda gains a purple palette based on Hilda from The Legend of Zelda: A Link Between Worlds for her default costume and gains a black costume with red hair inspired by Midna, loses the more accurate palette for her Ocarina of Time costume, gains a yellow palette for her Ocarina of Time costume in its place, her Hyrule Warriors costume (which is moved forward from her R-Alt), a black palette for it based on Argorok (a boss from The Legend of Zelda: Twilight Princess whose full title is Twilit Dragon: Argorok) and is unlocked after completing the Rewards Map's "Live out the illustration 'Boss Rush'!" mission, a white palette for it based on the armor she can possess in The Legend of Zelda: Spirit Tracks that's unlocked from the Grand Travels map, and a blue palette for it based on her official artwork from The Legend of Zelda: A Link to the Past.
 * Sheik gains a a purple palette that lines up with Zelda's Hilda-inspired palette and a black palette that lines up with Zelda's Midna-inspired palette for her default costume, loses the more accurate palette for her Ocarina of Time costume, gains a yellow palette for her Ocarina of Time costume, her Hyrule Warriors costume (which is moved forward from her R-Alt), a black palette for it inspired by Wizzro that's unlocked from Map 2 (Master Quest Hyrule Field) but with shades of red instead of shades of purple to better match Zelda's Argorok-inpsired costume, a silver palette for it inspired by Impa's appearance in Hyrule Warriors, and a blue palette for it that lines up with Zelda's A Link to the Past palette.
 * Ganondorf gains a purple palette and a pink palette for his default costume, a costume inspired by Zant from The Legend of Zelda: Twilight Princess (whose full title is Usurper King: Zant), his gray costume from SSB4, his Hyrule Warriors costume (which is moved forward from his R-Alt), a cyan palette for it inspired by Demon King Malladus from The Legend of Zelda: Spirit Tracks that's unlocked from the Grand Travels map, a purple palette for it inspired by Yuga from The Legend of Zelda: A Link Between Worlds (the main antagonist who successfully attempts to resurrect Ganon and eventually fuses with him for the final battle) that's unlocked from the Lorule map, and a white palette for it inspired by Gohma (a recurring cyclopctic arachnoid boss in the Legend of Zelda series) and is unlocked after completing the Rewards Map's "Live out the illustration 'Rulers of Twilight'!" mission.
 * Pikachu gains its green bandana and backpack costume (which is moved forward from its R-Alt), a costume of a light blue cowboy hat and neck string that seems to reference promotional art of the Pokémon Championships 2018 where it wore an almost similar outfit, a costume of a red bandana on its ear and a red scarf as a possible reference to how the Pikachu from Brawl evolved from the Pichu from Melee, its yellow costume from SSB4 and Ultimate, and its Pikachu Libre costume (which is moved forward from its Z-Alt).
 * Jigglypuff gains its Glasses costume from SSB4 and Ultimate, a costume of May's green headband from Pokémon Emerald, a costume of a cyan hat with a black ring pattern around it, and a costume of May's headdress from the anime episode Strategy With a Smile!.
 * Mewtwo gains its yellow and pink costumes from SSB4 and Ultimate, an orange costume, its purple costume from SSB4 and Ultimate (albeit more dark blue to better reference Shadow Lugia), and a dark-blue-and-orange palette for its Shadow costume that seemingly is an inverse of the odd orange-and-purple palette used in its debut Generation when played on a Super Game Boy.
 * Squirtle gains a new costume of rounded sunglasses and a black outfit that seems to reference the Shop 'n' Squirtle program in Pokémon Channel, a blue palette for it, a red palette for it that may be in reference to Trapinch, a green palette for it, a and gray-and-red palette for it that may be inspired by Blaine.
 * Ivysaur gains a new costume inspired by witches and Hex Maniacs from Generation III, a black palette for it, a red palette for it, a green palette for it reminiscent of stereotypical witches, and a blue palette for it.
 * Charizard gains its Mega Charizard X costume (which is moved forward from its Z-Alt), a red palette for it, a green palette for it, a purple palette for it, and a cyan palette for it based on the Mega Evolution's Shiny palette.
 * Lucario gains its Mega Lucario costume (which is moved forward from its Z-Alt), a pink palette for it, a cyan palette for it, a blue palette for it, and a yellow palette for it based on the Mega Evolution's Shiny palette (albeit retaining the blue eye error that would be fixed in Project+ Version 2.3).
 * Samus gains her pre-Project+ Green Team costume (albeit adjusted to fit her model), her Dark Samus-inspired colors from Project M (albeit adjusted to fit her model and colored to match Dark Samus's true form), a silver costume that seems to reference the Federation Troopers, a yellow costume based on her Power Suit from the Metroid Prime games, an orange palette for her Classic Suit costume that references both the Varia Suit and Samus's in-game sprite from Metroid, a purple palette for her Classic Suit costume that references the Gravity Suit, a green palette for her Classic Suit costume that references both Metroids and Samus's in-game sprite from Metroid II: Return of Samus when played on the Super Game Boy, and a costume based on her appearance in Metroid: Other M with a blue palette and a sleeker appearance.
 * Zero Suit Samus gains a white-and-black costume, a dark green costume, a black costume that matches the motif of Samus's Dark Samus-inspired costume, a yellow costume, a red palette for her Justin Bailey costume, and her Cadet Samus costume (which is moved forward from her Z-Alt).
 * Ness gains his Ninten-inspired costume (which is moved forward from his R-Alt), a green palette for it, a purple palette for it, a black palette for it, and a pink palette for it.
 * Lucas gains his green and purple costumes from SSB4 and Ultimate, a blue-and-pink costume inspired by Kumatora (even featuring her sprite on the front of his shirt), a pink costume that features a sprite of the Ultimate Chimera on the front of his shirt, and a red-and-white palette for his EarthBound 64 costume.
 * Kirby gains a light yellow palette for his Fighter costume inspired by Keeby's in-game sprite from Kirby's Dream Course, a yellow palette for his Fighter costume, a monochrome palette for his Fighter costume (which matches a similar palette for his default costume, even in vBrawl), a black palette for his Fighter costume inspired by Shadow Kirby (albeit taking direct inspiration from Kirby & the Amazing Mirror compared to Shadow Kirby's appearance in the Kirby Fighters series) and the Shadow Spray Paint, a purple palette for his Fighter costume inspired by the in-game sprite for Ninja Kirby from Kirby Super Star, and an orange palette for his Fighter costume inspired by the in-game sprite for Suplex Kirby from Kirby Super Star.
 * Meta Knight gains a white palette for his Morpho Knight-inspired costume, a purple palette for his Morpho Knight-inspired costume, his Samurai Kirby costume that would be added in Project+ Version 2.3 (albeit visually differing from the aforementioned update by having black markings instead of a scar, similarities to his default costume, and a more katana-like sword) and its respective red and green palettes, a second red palette for his Samurai Kirby costume, and a black palette for his Samurai Kirby costume that bears a slight resemblance to a mix of his artwork and in-game sprite from Kirby's Adventure.
 * King Dedede gains a yellow costume with his obi showing Waddle Dees (akin to his green costume from SSB4 and Ultimate), a black costume based on Parallel Dedede from Kirby Star Allies, a costume based on King D-Mind from both Team Kirby Clash Deluxe and Super Kirby Clash (both in which he's summoned and turns against his own summoner; in the former's case, it's Dark Taranza, and in the latter's case, it's Parallel Nightmare), his orange costume being relegated to it, a green palette for it, his blue costume from SSB4 and Ultimate as part of it, and his Shadow Dedede costume (which is moved forward from his R-Alt).
 * Marth gains his vBrawl yellow costume, a yellow palette for his Sigurd-inspired costume, a costume inspired by his Echo Fighter Lucina, a red palette for his Lucina-inspired costume, a green palette for his Lucina-inspired costume, and a brown palette for his Lucina-inspired costume.
 * Roy gains a brown costume, a costume based on Marth (the character he was based on in both Melee and Project M) with a yellow gem instead of a red gem, a red palette for it, a green palette for it, and a yellow palette for it.
 * Ike gains a dark green costume, a black costume, a dark blue costume, a dark blue palette for his Hector-inspired costume, and a black palette for his Greil-inspired costume.
 * Mr. Game & Watch gains a hot pink costume with a purple outline, a yellow costume with an orange outline, a light green costume with a green outline that could possibly reference the palette of the original Game Boy, a dark green costume with a light green outline, a yellow costume with a pink outline, and a dark cyan costume with a cyan outline.
 * R.O.B. gains a a cyan costume inspired by the colors of a Nintendo 3DS, a green costume inspired by his disguise as the Ancient Minister in The Subspace Emissary, a costume that replaces his head with a Super NES containing a copy of Super Mario World inserted, his Nintendo 64 costume (which is moved forward from his R-Alt), his GameCube costume (which is moved forward from his Z-Alt), a beige palette for his Mario Kart DS costume based on his default costume with his kart featuring Disk-Kun (the mascot of the Famicom Disk System), and a purple palette for his Wii costume.
 * The Ice Climbers gain their orange-and-lavender costume from Melee, a purple costume, a brown-and-light-brown costume, a turquoise costume, and a black-and-white palette for their Tundra costume with highlights that match the colors of their respective default costume.
 * Pit gains his Three Sacred Treasures costume (which is moved forward from his R-Alt), a red palette for it that references Dark Pit, a green palette for it, a blue palette for it that seemingly references the colors of Amazon Pandora from Kid Icarus: Uprising, and a black palette for it that also references Dark Pit.
 * Olimar gains a white-and-green costume based on his own son, a white-and-blue costume based on his wife, and palettes for his Bad Ending costume that reference the Red Pikmin, Yellow Pikmin, and Blue Pikmin, respectively.
 * Snake gains a blue costume, a green costume, a yellow costume, a pink costume, and a rainbow palette for his Big Boss-inspired costume.
 * Sonic gains the planned costume inspired by Dr. Eggman, a costume inspired by Blaze the Cat, the planned costume inspired by Jet the Hawk, a costume inspired by Amy Rose, and a red palette for his Racing Suit costume.
 * Knuckles gains a light green costume, a costume inspired by Shade the Echidna, a costume inspired by Storm the Albatross, a costume inspired by Rouge the Bat, and a dark blue palette for his Garam-inspired costume.
 * Peach's Z-Alt gives her a costume based on Peachette from New Super Mario Bros. U Deluxe while her R-Alt gives her a palette based on Pauline (including a lack of crown).
 * Yoshi's Z-Alt gives him a costume based on his appearance in Yoshi's Woolly World.
 * Bowser's Z-Alt gives him a costume based on Fury Bowser from Super Mario 3D World + Bowser's Fury.
 * Donkey Kong's R-Alt gives him a costume based on his appearance in Mario Strikers Charged.
 * Captain Falcon's R-Alt gives him a costume based on his appearance in F-Zero X.
 * Falco's Z-Alt gives him a costume that replaces him with his Star Wolf rival, Leon Powalski.
 * Link's Z-Alt gives him a costume based on the color scheme of his appearance in The Legend of Zelda: Skyward Sword, while his R-Alt outfit he wears at the start of Hyrule Warriors.
 * Toon Link's Z-Alt gives him a costume based on the Sword Master Suit from The Legend of Zelda: Tri Force Heroes.
 * Zelda's R-Alt gives her a costume based on her appearance in The Legend of Zelda: Skyward Sword.
 * Sheik's R-Alt gives her a costume based on Impa's appearance in The Legend of Zelda: Skyward Sword.
 * Ganondorf's R-Alt gives him a costume based on Phantom Ganon's appearance in The Legend of Zelda: The Wind Waker.
 * Pikachu's Z-Alt gives it the white costume from SSB4, while its R-Alt gives it the purple costume from SSB4.
 * Charizard's Z-Alt gives it a costume with visual similarities to Shadow Lugia from Pokémon XD: Gale of Darkness.
 * Lucario's Z-Alt gives it the Robo-Lucario costume that was replaced with a costume based on Riley (Sir Aaron in Lucario and the Mystery of Mew).
 * Samus's Z-Alt gives her a costume that replaces her with her Echo Fighter Dark Samus, while her R-Alt gives her a costume based on her appearance in Metroid Dread.
 * Zero Suit Samus's Z-Alt gives her a costume inspired by the colors of Dark Samus, while her R-Alt gives her the default costume lifted from vBrawl.
 * Ness's R-Alt gives him a costume based on the robot form used in EarthBound when he and his friends have to explore the Cave of the Past.
 * Kirby's R-Alt gives him a costume based on Shadow Kirby as he appears in Kirby Fighters Deluxe and Kirby Fighters 2.
 * Meta Knight's R-Alt gives him a costume inspired by Dark Matter's first phase from Kirby's Dream Land 2 and the Dark Matter Clone from Kirby: Planet Robobot.
 * King Dedede's Z-Alt gives him a costume inspired by his appearance in the Quick Draw Sub-Game from Kirby's Adventure, while his R-Alt gives him a costume that replaces him with a miniature version of Robo Dedede from the Scope Shot Sub-Game in Kirby's Return to Dream Land.
 * Ike's Z-Alt gives him a costume based on his appearance in Fire Emblem: Radiant Dawn (which is used in his appearances in SSB4 and Ultimate).
 * Mr. Game & Watch's Z-Alt gives him a costume inspired by false characters from The Subspace Emissary.
 * R.O.B.'s Z-Alt gives him a costume that replaces his head with an NES, while his R-Alt gives him a costume based on his appearance as the Ancient Minister from The Subspace Emissary.
 * Sonic's R-Alt gives him a costume based on Darkspine Sonic from Sonic and the Secret Rings.
 * Additonal Stage layouts include a Sky Sanctuary variation based on Mirage Saloon Zone from Sonic Mania, a Metal Cavern variation based on Snowman's Land from Super Mario 64, a Delfino's Secret variation based on Daisy Circuit from Mario Kart Wii, and amalgamations of familiar Stages with their own variations based on Chocolate Island 2 from Super Mario World, Baby Bowser's Castle from Super Mario World 2: Yoshi's Island (namely, the second phase of the fight against Baby Bowser where Kamek has caused him to grow to a kaiju-like size), Eggmanland from Sonic Unleashed, the title screen of Wario Land 4, Sky Pillar from Pokémon Ruby & Pokémon Sapphire, and others. The amalgamated stages have name mashups like "Dead Line Zone" and "Skyfield", to name a few.

Downloading instructions
The mod can be downloaded here.