In an interview with competitive Super Smash Bros. player Hungrybox, the developers of Nickelodeon All-Star Brawl claimed that the game would feature cross-play in a future update. Cross-play was eventually finished for the game, but was not able to be released due to Nintendo's strict guidelines on cross-play. On March 3, 2023, the game was released on the Epic Games Store, and cross-play between PC and Switch was accidentally added without announcement, but was removed shortly after, though cross-play between Epic Games and Steam players would continue to exist in the game.
Cross-play would eventually be included in the base game of Nickelodeon All-Star Brawl 2 for all consoles and generations.
In Super Fall Brawl, one of the many reskins of Jingle Brawl, the new character was intended to be Sheen Estevez from Jimmy Neutron, in promotion for his then-new spin-off series Planet Sheen. However, Sheen was not coded correctly, making him near-impossible to beat in a fight. The game's second update would remove Sheen and his stage completely, and he would never be added back in, making Fall Brawl the only Super Brawl game without any new combatants. Sheen would return in Super Brawl 2, though the House of Pain stage, based on the first episode of Planet Sheen, would be swapped for a Zeenu stage generally based on Planet Sheen instead of a single episode.
Nickelodeon All-Star Brawl was originally intended to feature alternate palette swaps for every character on the roster, but this was rejected by Nickelodeon, who only wanted costumes that reference the shows directly. The only known planned recolors are for SpongeBob that were based on other characters from the show: Squidward blue, Patrick pink, and Mr. Krabs red.
Nickelodeon All-Star Brawl contains multiple unused announcer lines - including multitudes of character names (including characters from Rocko's Modern Life and Jimmy Neutron: Boy Genius, which were not represented in the base version of the game), item announcement calls which (despite the narrator having used voice clips relating to the items) did not end up being used, all of the stage names (notably including alternate names for the Slime Time stage in the form of "Double Dare", "Double Dare Stage", and "Double Dare Extreme") and, perhaps most interestingly, lines relating to a shop feature where the player could buy outfits, characters, moves, and stages. The reveal press release for All-Star Brawl references the ability to "unlock advanced moves", which may be referring to this scrapped feature.
In prototype versions of McDonald's Treasure Land Adventure, the shops were McDonald's restaurants, and all the meters and power-ups in the game were McDonald's products. McDonald's burgers as health items in a game could be seen as endorsing them as a healthy food, so it was likely changed for the final game to avoid this perception, and while at the time Ronald McDonald was still seen holding or eating McDonald's in advertising, in later years he would be mandated against doing either.
Courage the Cowardly Dog: Creep TV has secret codes and levels that went undiscovered until 20 years after its release due to a glitch making them inaccessible. The "daScore" code, which shows a counter of how many ghosts you've zapped; and the "mirage" code, which expands the game map and allows access to secret levels - one where you can acquire glasses, and another that has a sign simply reading Eustace's catchphrase, "STUPID DOG!" - however, if you get the glasses then read the sign, it will instead say "Wee...amazing! You found it! GOOD DOG!"
Annoying Orange: Kitchen Carnage contains files related to toasters and burners, implying that they may have been extra appliances to kill fruit with in the game alongside blenders, cutting boards, and fans.
amiibo Tap: Nintendo's Greatest Bits contains two unused ROMs in its code: Mario Bros. for NES and Super Mario All-Stars for SNES. Notably, Super Mario All-Stars never had a Wii U Virtual Console release. (though it was playable on the console through the Wii disc, Super Mario All-Stars Limited Edition)
The reason Scrooge McDuck wears his red cloak from the Carl Barks comics and DuckTales reboot instead of the blue cloak from the original DuckTales TV series is because the blue cloak didn't stand out enough alongside blue and black level backgrounds.
In the Piko Interactive Collection 2 for the Evercade, Barkley: Shut Up & Jam and its sequel are included under the revised name of Hoops: Shut Up & Jam, with all likenesses of Charles Barkley swapped for a single Adobe stock photo of an angry black man, named "Joe Hoops" by the game text.
In Greenflower Zone Act 1, there is a house in the upper section of the level next to a lake. If the player has all 200 Emblems, this house will have a note on it thanking the player for keeping the game alive.
This house belongs to the in-universe persona of RedXVI, an old member of the Sonic fangame community who had significant influence over Sonic Robo Blast 2's development.
The location of this note is a reference to Version 1.09 of the game, where an Easter egg was hidden on the very same house. In this version, jumping on the house would cause RedXVI to come out and send the player to an early work-in-progress version of Red Volcano Zone Act 1 if the player jumped on the house repeatedly after beating the game three times.
Shortly after Nickelodeon All-Star Brawl's launch, the PC version of the game suffered a mysterious anomaly on its online modes informally known as the "items virus", where unfinished placeholder items would show up on the casual quickplay online mode, and then appear in offline modes with no way of turning them off except for restarting the game, all the while spreading the items to anyone you play with online.
Because the developers were still experimenting with Double Battles where the player teams up with an NPC ally to fight two NPC opponents, this lead to a glaring oversight during the battle where the player joins with Steven Stone to battle Maxi and Tabitha where, during the battle, Steven's Level 42 Metang can actually gain a substantial amount of EXP simultaneously with the player's own Pokémon. This essentially means that, with careful manipulation, the player can have the ally Metang get enough EXP to grow to Level 43. This so far is the only instance in the entire Pokémon main series where, in a non-scripted battle, an NPC's Pokémon can gain EXP and level up.
Early development plans involved Annalynn being released as part of a 4-in-1 collection of arcade-style titles. The other games were dropped to focus on Annalynn.
At Spaceworld 2000 during the unveiling of the GameCube, there were five models that came from backstage each one holding a uniquely colored GameCube, the hot pink color never seeing an official release. Each GameCube featured a small window cut into the jewel (black circular disk atop the GameCube) allowing for the player to see the disk and disk tray. These prototypes do not actually function as they were made just to be shown at Spaceworld 2000.
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On December 14th, 2012, a shooting occurred at Sandy Hook Elementary School, killing 27 people including the shooter. Hours later on the same day, the unauthorized mobile game Gangnam Style Massacre received an update that completely retooled the game from a William Tell-inspired bow-and-arrow game taking place on a school backdrop to an endless runner taking place in a haunted forest, renaming the title to Gangnam Dance School.
The Battle Cards from Kingdom Hearts: Chain of Memories were intended to appear in Super Smash Flash 2. They would have summoned characters from Disney movies, with Genie; Stitch; and Jack Skellington being named as planned summons. The item was scrapped due to conceptually overlapping with Assist Trophies and Poké Balls.
Bart Simpson and Godzilla were planned to be playable in NBA Jam, but were scrapped. There exists a video from NBA Jam's development showing reference footage of Bart and Godzilla action figures being filmed against a blue screen, as well as color palletes in the game's code labeled "B" and "G", which have yellow and green scales respectively.
The originally planned title for Missile Command was, in fact, "Armageddon" - though this name was vetoed by upper managment due to issues that children would have with spelling and pronouncing the name. It's also suggested that various members of Atari's upper managment didn't know what the word actually meant. As such, the alternative title of "Missile Command" came about.