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Tank Battalion / Battle City
A secret message can be found on the title screen of the NES version of the game with the use of two controllers. At the title screen, select "CONSTRUCTION" on the menu. Press Start on Controller 1 to enter the mode, then press it again to return back to the title screen. Repeat this seven times. After the seventh enter-and-exit, hold Down on Controller 1 and press A eight times on Controller 2. Then, hold Right on Controller 1 and press B twelve times on Controller 2. Finally, press Start on Controller 1 to activate the message featuring an animation of a green droplet falling.


The most likely person as to the identity of "Open-Reach" is Tomcat System's founder and programmer Ryoichi Ookubo because of the similarities between "Reach" and "Ryoichi". It should be also noted that his name is hidden twice in the game's ROM, and from one fact pointed out by a Russian LiveJournal user, that the name Open-Reach appears as "OPR" on the title screen of another game Tomcat System developed, the 1991 Famicom game Castle Quest published by Hudson Soft.

As for Noriko, her identity remains unknown. In the comments section of the sourced video, one commenter claimed that Noriko was Ookubo's daughter who was three years old at the time of the game's development, while the aforementioned LiveJournal user claimed that Noriko was a romantic partner, claiming her to be a former Namco graphic designer named Noriko Ikegawa (whose name would later appear in the credits for the Nintendo game Animal Crossing as a model designer), but there is no substantial evidence to support either of these claims.
Contributed by MehDeletingLater
Paper Mario
At the Toad Town train station, there is a blue Toad who tells Mario that after he defeats Bowser and restores peace to the Mushroom Kingdom, he has something else he wants to tell him. However, no such event can be triggered as it's impossible to access the train station after defeating Bowser, making the line pointless as you cannot talk to him again. It's possible that this was meant to be part of content found in the post-game, but was cut during development.
Contributed by MehDeletingLater
Pokémon Scarlet & Violet
The Pokémon Toedscool and Toedscruel (divergent evolutions of Tentacool and Tentacruel) are called "OKAKINGU" and "OKAGYARADOSU" in the game's data respectively. This is interesting as these names seem to instead reference the names of Magikarp, called "Koiking" in Japan, and its evolution Gyarados respectively, meaning that the games were originally going to feature a pair of divergent evolutions for the Gyarados family instead of the Tentacruel family. However, there is no other data in the games but names for these scrapped Pokémon.
Contributed by PirateGoofy
The Legend of Zelda: Breath of the Wild
If you listen closely to the music being played in the Divine Beasts, you can make out Morse code for "S.O.S." This is very likely a distress call the Champions made when they were attacked by the Ganon Blights 100 years prior to the start of the game.
Contributed by raidramon0
Pokémon Scarlet & Violet
Although the Paldea region is based on Iberia, its starters may take inspiration from the modern culture and fauna of New World places that Spain and Portugal colonized and influenced. Specifically:

•The Skeledirge line may represent Mexico. Its name, secondary ghost-typing, and skeletal imagery evokes Mexico's Día de Los Muertos (Day of the Dead), a celebration of the former lives of deceased loved ones where, among other things, celebrators may dress in flamboyantly colored costumes and paint skulls on their faces. Crocalor also has a head growth resembling a Sombrero. This and the line's theme of singing to attack may also be a reference to Mariachi folk music. In a fauna sense, Crocodiles are also endemic to Mexico.

•Quaquaval's influence may derive from Brazil's culture. This can be seen in the name which has elements of Carnival, a Catholic festive season popularly celebrated in Brazil with lavish parades. In addition, it being part fighting-type and being dance-themed may be based on the Brazilian martial art of Capoeira, a fighting style that heavily resembles dancing in many of its moves. Quaquaval is also based upon the South American Crested Duck.

•Meowscarada, while possibly taking inspiration from Iberia itself with its resemblance to the Iberian Lynx, could also take cues from the Southern United States, specifically the State of Louisiana. This is because New Orleans, in Louisiana, is known for its Mardi Gras (Fat Tuesday) celebrations as part of Carnival, which iconically feature performers in elaborate masks, hence Meowscarada's name evoking the word Mascarade. Although Louisiana was influenced by France, it was also conquered by Spain later, along with a lot of the Southern U.S. It may also be based on Louisiana's prominent diasporic religion surrounding Voodoo. Meowscarada's species may furthermore be based off of the Bobcat/Red Lynx, a relative of the Iberian Lynx.
Contributed by PirateGoofy
Pokémon Scarlet & Violet
Tandemaus and Maushold may have dark origins as they may be based on the concept of a "Rat King", where several rats' tails are tied together or tangled by a person (although there have been reported cases of this happening without human interference). Explaining the German-sounding name of the Pokémon, the Rat King concept is named after the German term "Rattenkonig" which, in turn, is based on the villain of the same name from the short story "The Nutcracker and the Mouse King" who is sometimes depicted as being comprised of several mice or rats.

Also the Pokémon themselves may be aesthetically based on toy-like dioramic objects called "Sylvian Families" in Japan (or "Calico Critters" in English countries) which are essentially dressed-up mouse dolls in different whimsical small settings that make the mice look more like a human family. These Sylvian Families started in Japan in the 1980s, which is when many of the veteran developers at Game Freak would have grown up.
Contributed by PirateGoofy
Persona 5 Royal
Shujin's psychiatrist Dr. Takuto Maruki is introduced during the month of May and is always offering snacks to anyone that visits him. The protagonist can even obtain some healing items when he visits him during certain ranks. This is probably due to Spoiler:how he visited Rumi in the hospital empty-handed after her traumatic experience where a burglar broke into her home and murdered her parents. Maruki then tries to have snacks on hand to give to students in an effort to remember her.
Contributed by raidramon0
Series: Pokémon
In Pokémon Scarlet & Violet, Roaring Moon's Violet Dex entry as well as the occult magazine's description of the Paradox Pokémon both imply that there is a deep connection between Roaring Moon and Mega Salamance. Considering that Roaring Moon, like all past Paradox Pokémon, is a prehistoric version of an existing Pokémon, in this case Salamance, this could mean that there is also a connection between Mega Evolution and Pokémon prehistory.
Contributed by PirateGoofy
Series: Pokémon
Foongus' Pokemon Scarlet PokéDex entry states that there is an in-universe theory that the "creator of the modern day Poké Ball" was inspired by the Pokémon's appearance when designing the device.
Contributed by PirateGoofy
Pokémon Scarlet & Violet
Primeape's new Ghost-Type evolution, Annihilape, obtained by Primeape using the move Rage Fist 20 times, is a possible reference to Primeape's previous PokéDex entry about how it could suddenly die if it gets way too angry.
Contributed by PirateGoofy
Sonic Frontiers
In rare instances throughout the game, characters that didn't appear in Sonic Frontiers are referenced in passing, such as Cream, Shadow, Rouge, Blaze, Jet, Omega, Yacker the Wisp, and Zavok of the Deadly Six. However two of these voice lines reference Sticks the Badger and Tangle the Lemur, two characters who have not appeared in the mainline game series at all. While Sticks previously had a character page among other mainline characters on the Japanese Sonic Channel website, she has so far only appeared in the spin-off series Sonic Boom, while Tangle has so far only appeared in IDW Publishing's Sonic the Hedgehog comic book series. Thus Sonic's name drop of them in this mainline title essentially establishes the characters as canon to the Sonic game series. This Easter egg may have come about due to the fact that Sonic Frontiers' writer Ian Flynn is also a co-writer of the IDW comic series.
Contributed by PirateGoofy
Sonic Frontiers
Some of the Cyberspace levels have layouts and elements taken almost directly from previous Sonic games, even if the aesthetics of the Cyberspace levels don't match the legacy ones at all sometimes. They are as follows:

Zone 1-1: Windmill Isle Act 1 from Sonic Unleashed

Zone 1-2: Windmill Isle Act 2 from Sonic Unleashed

Zone 1-4: Green Hill Act 2 from Sonic Generations

Zone 1-5: Chemical Plant Act 2 from Sonic Generations

Zone 1-6: Green Hill Act 1 from Sonic Generations

Zone 1-7: City Escape from Sonic Adventure 2

Zone 2-1: Green Hill Act 2 from Sonic Generations (2D sections)

Zone 2-2: Dragon Road Act 3 from Sonic Unleashed

Zone 2-4: Shadow's Radical Highway level from Sonic Adventure 2

Zone 2-5: Sky Sanctuary Act 2 from Sonic Generations (2D sections)

Zone 2-6: Shadow's Sky Rail level from Sonic Adventure 2

Zone 2-7: Sky Sanctuary Act 1 from Sonic Generations

Zone 3-1: Green Forest from Sonic Adventure 2

Zone 3-2: Savanna Citadel Act 1 from Sonic Unleashed

Zone 3-3: Sky Sanctuary Act 2 from Sonic Generations (3D sections)

Zone 3-6: Rooftop Run Act 2 from Sonic Unleashed

Zone 3-7: Chemical Plant Act 2 from Sonic Generations (2D sections)

Zone 4-1: Metal Harbor from Sonic Adventure 2

Zone 4-6: Chemical Plant Act 1 from Sonic Generations
Contributed by PirateGoofy
NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
In the game's Beta, Tier 15 of the battle pass features the rewards of Pajama Finn and the feline character Cake, both from the animated series Adventure Time. This is a possible euphemistic reference to the "Tier 15 of Dating" joke from the series episode "Burning Low" implying in-game that Tier 15 is bestiality, although it's never actually stated what Tier 15 is in the episode.
Contributed by PirateGoofy
Saints Row 2
In the Xbox 360 version of the game, there is a bizarre game-breaking glitch that can be triggered. This glitch is not exclusive to this version, but it's most easily executable there due to the physical release of the Xbox 360 version containing an earlier build of the game that has not been updated to fix the glitch.

First, turn on the cheat codes for Low Gravity (#18), Infinite Ammo (#11), Never Die (#36), and Super Explosions (#7), and then start playing the Zombie Uprising game. When you unlock the Hand Grenades, go to a specific marquee on the map, aim correctly, throw a grenade behind you and jump. If done correctly, you will be launched onto the ledge. Go further into another corner of the building on the ledge and use a second grenade to launch yourself out of bounds. Once you successfully glitch yourself out of the map, you will fall into the void, and be respawned in the main overworld with the Zombie Uprising HUD still present (the actual location you are respawned in appears to vary with each copy of the game). From this point on, random events occur as a result of the enabled cheats and the game trying to run in spite of the glitching, including floating debris, surprise zombie attacks, or moments where you just float around. As the game continues to break down, all items inside of buildings will disappear, random items outside will vanish, and the sky will eventually turn a bright, blinding white. However, despite all of these worsening side effects, the killing blow can occur at any time. At a random point, a grainy, ice-blue silhouette will flash on a nearby wall, and within the next few seconds, the game will freeze, permanently damaging the game itself and rendering it unplayable.

This glitch, and specifically the silhouette, has come to be known as "The Freezer", and since its discovery had lead to the corruption of numerous physical copies of Saints Row 2 for research purposes. The Freezer effect itself is believed to occur when the game tries to spawn either a zombie NPC or the player's shadow in an invalid location, specifically after the player had previously glitched out of the Zombie Uprising map and back into the main overworld. The digital Xbox 360 version of the game is not believed to have this glitch, as it had been patched unlike the physical version.
Contributed by MehDeletingLater
Brütal Legend
On the Beach in the northern part of the Western Continent, in a hole in the ruined structures in the area, angling the camera correctly will reveal an out-of-bounds picture of an Asian woman. This person was world builder Fred Selker's girlfriend at the time of the game's development, and its placement at the northern-most/highest area on the world map could be a gesture of affection towards her.
Contributed by MehDeletingLater
Mortal Kombat: Shaolin Monks
Several unused enemies, as well as evidently bosses, still exist within the game's data and can be spawned in-game with a proper third-party cheating device.

A Naga-styled enemy (In Japanese mythology, the Naga is a snake-based monster with the upper torso of a vicious woman) is one notable example, as well as an anthropomorphic demonic tiger which utilized some type of area-of-effect based ice powers. Most notably of all is a towering, multi-armed Hindu-inspired being with green skin and wind-based attacks, who also has functioning "jiggle physics" coded for her breasts during certain animation frames. This unused boss noticeably towers over the player's when hacked in, filling a decent portion of the player's screen.

Although not yet explicitly stated by any developers of Shaolin Monks, it's possible that should these unused characters have made it into the final release, their designs could have emphasized the lore and world building aspects that John Tobias was publicly passionate about in the early installments of the Mortal Kombat continuity. It's equally possible that the two bosses in particular were scrapped simply due to their in-game models holding such stature that extra time and resources would need to be invested in specially designing stages which would house their positions in the linear progression of the story. Hacking either boss in as mentioned above will cause them to clip through surfaces in many of the playable environments.
Contributed by Regen-33
LEGO Batman: The Videogame
Due to the Instruction manual mentioning a "young Tim", and the DS version having a Tim Drake character, the primary Robin in this game is most likely Tim Drake.
Contributed by PirateGoofy
Elden Ring
The sorcerous NPC character Selvius may be based on the enigmatic wizard Severus Snape from the Harry Potter franchise. Both have similar first names and Selvius speaks in a posh, judgmental, and condescending tone just as British actor Alan Rickman does frequently in his performance as Snape in the Harry Potter film series.
Contributed by PirateGoofy
Pokémon Platinum
In Platinum and HeartGold & SoulSilver, Bidoof's gender difference has more to it than in any other game. In Diamond & Pearl and every future game after HG/SS, Bidoof's gender difference is that the male has an additional 2 curls on the tail. However in these 3 games, Bidoof's patch of white around the face has a more pronounced bump in between the eyes on the male, with a more flattened bump on the female. Whether this is intentional or not is unknown, but due to the fact it was fixed later in Generation V, it's safe to assume this was a mistake.
Contributed by TrainerRobo
In 2021, several cheat codes were discovered in the Game Boy version of the game, the first two of which must be activated through the title screen.

•Ending and Credits: Up/Down/Left/Right/Select/Start.

•Sound Test: Down/Up/Down/Up/Select/B.

•Level Select: While paused in normal gameplay, press Down/Select/Up/Left/Select/Right/B. Press A or B to select a level.

Hidden Tribute to Hiroko Kasahara: To access it, you must first access the Sound Test menu. Then, set the BGM/SE index to 02 and press A once, then set BGM/SE index to 19 and press A once more. Lastly, you must input the following lengthy code:
Up, Up, Down, Down, Left, Left, Right, Right, Select, Select, Up, Up, Down, Down, Left, Left, Right, Right, B, B, Up, Down, Left, Right, Select, Up, Down, Left, Right, B, Select, Right, Left, Down, Up, B, Right, Left, Down, Up, Select, Select, Right, Right, Left, Left, Down, Down, Up, Up, B, B, Right, Right, Left, Left, Down, Down, Up, Up, Start.

If inputted correctly, an alternate credits sequence will play out. The normal credits plays the game's ending theme and lists the name of programmer Yutaka ★Hiroko★ Sakashita among the game's developers. This alternate credits sequence instead plays the Vs. Mode music and lists the name Hiroko Kasahara at the top of the screen. Kasahara is a J-Pop singer, and the names of the game's developers in the credits are replaced with a comprehensive discography featuring the names of several albums she had released up to 1993, including the release dates for her then-upcoming 1993 albums "L'Express Fantasie" and "Nature". Considering Sakashita used Kasahara's first name on the standard credits sequence, he is most likely the one who included this Easter egg to document his love of her music at the time the game shipped. The fact that this sequence is hidden behind two cheat codes that would take almost 30 years to be discovered, with one of them being too long to easily guess, suggests that it was never meant to be seen by players.
Contributed by MehDeletingLater
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