Smash Bros. 64
This minigame featured in Smash Bros. 64's 1P Game never returned in any later Smash game.
What is Board The Platforms?
This newcomer character has a unique unlocking condition of requiring 20 hours of playtime in Versus Mode.
Who is Mewtwo? (Can also be unlocked by playing 700 Versus matches.)
This option in the Vault submenu contains a nearly-comprehensive list of all Nintendo-published games published up until Smash Bros. Brawl's release.
What is Chronicle?
These characters are the only ones in the history of the Smash series to be banned from all online play.
Who are Mii Fighters?
This stage was added to Smash Bros. Ultimate as a free update in June 2020.
What is Small Battlefield?
The original name for the demo of Smash Bros. before series creator Masahiro Sakurai got permission to use Nintendo characters.
What is Dragon King: The Fighting Game?
This stage theme was the first song in the Smash Bros. series to feature vocals.
What is the DK Rap?
This stage, which was originally misnamed, was the only one out of Brawl's new stages to have its name changed in Smash Bros. Ultimate.
What is Figure-8 Circuit? (formerly Mario Circuit)
This character is the only one to have different voice actors between the American English and British English versions of the game.
Who is Wii Fit Trainer?
The primary announcer for Super Smash Bros. 4 & Ultimate, Xander Mobus, also voices this playable character in Ultimate.
Who is Joker?
This stage was the only one out of Smash 64's stages to have its name entirely changed in Smash Ultimate.
What is Super Happy Tree? (formerly Yoshi's Island)
This playable character made their official debut in Super Smash Bros. Melee before appearing in their home series.
Who is Roy?
This veteran character, if not unlocked through Brawl's story mode The Subspace Emissary, has the completely unique unlocking requirement of reflecting 10 projectiles in a single match.
Who is Ness?
What is an opening movie?
In Smash Bros. Ultimate, every character's jump was sped up and standardized to only take 3 frames. This newcomer character is the only one who takes longer than 3 frames to do so.
Who is Kazuya Mishima?
Unused voice clips found in Smash 64's files reveal that this game mechanic introduced in Smash Bros. Brawl was meant to be in the original game.
What are Final Smashes?
Melee is the only game in the Smash series to lack these unique animations for each character.
What are On-screen appearances? (AKA entrance animations)
Super Smash Bros. Brawl's primary announcer, Pat Cashman, was previously the announcer for this educational TV series.
What is Bill Nye the Science Guy?
While this game mode is present in both versions of Smash Bros. 4, the order of opponents is reversed between the 3DS and Wii U.
What is All-Star Mode?
This stage is the only DLC stage that can appear in the story mode, World Of Light, if the player has already bought the corresponding character.
What is Cloud Sea of Alrest?
This character was the most-requested newcomer in the Super Smash Bros. Poll held on Smash 64's official Japanese website in 1999.
Who is Bowser?
This Pokemon was planned to appear when using the Poke Ball item in Smash Bros. Melee, but was left as unused content until Smash Bros. Ultimate.
Who is Ditto?
This enemy in Brawl's story mode, The Subspace Emissary, was effectively cut and cannot be fought, but makes a cameo appearance in one level and has a collectible trophy.
Who is Mizzo?
This movement mechanic, introduced in Brawl, was only present in the Wii U version of Smash Bros. 4, and cut completely in the 3DS version.
What is swimming?
This character is the only one of the Original 8 starter characters whose Classic Mode route only allows them to unlock 7 characters instead of 8.
Who is Pikachu?