Although the game makes no mention of it, completing each chapter again after finishing Emerl's episode will reward the player with a page from Spoiler:Professor Gerald Robotnik's journal which documents Spoiler:his discovery and subsequent experiments on the Gizoid.
Generica's holiday outfit is a reference to the outfit worn by Jack Skellington, the main character of the 1993 stop-motion animated film "The Nightmare Before Christmas". When given said outfit, she'll state "What's this? What's this? This outfit reminds me of a nightmare I had once, just before Christmas.", which not only alludes to the film's title, but also to the song "What's This?" from the film, which is sung by Jack when he first arrives in Christmas Town.
The "Sausage" and "Legendary Sausage" weapons in Holocure: Save the Fans! are based on the mobile games Sausage Legend and Sausage Legend 2, which are known for being played on livestreams by Hololive talent Oozora Subaru and her viewers. According to developer Kay Yu, he was granted permission by the Sausage Legend developers to reference the game via these weapons and its collaborations. In 2023, the references culminated in Hololive working with the Sausage Legend developers to release special skins for Sausage Legend 2 based on Subaru and fellow member Hakui Koyori.
While the other Code Monkeys games featuring mockbuster films used images from the films themselves for their sliding puzzle and coloring minigames, Lion and the King instead uses unauthorized frames from the 1965 anime adaptation of the manga Kimba the White Lion. Coincidentally, TV and film adaptations in this franchise have also been used in various plagiarism allegations relating to Disney's 1994 film The Lion King, the movie that Lion and the King plagiarizes.
By scanning a Fox or Falco amiibo in Star Fox Zero, the Arwings and Walkers will be swapped out with 16-bit era models as seen in Star Fox and Star Fox 2. The old Arwing model's Charge shot does not lock on to targets, which reflects how they did not have a lock-on feature in Star Fox, but only in Star Fox 2 did they have a Charge shot. At the time of Star Fox Zero's release in 2016, Star Fox 2 remained unreleased, with only leaked beta builds being available, including one that allowed you to lock on to enemies with the Charge shot. The game would eventually be completed by Nintendo and released in 2017, but with this lock-on feature removed. Since Nintendo only showed Star Fox 2 to developers actively working on the series, it's believed that PlatinumGames noticed this feature's removal and referenced it in Star Fox Zero over a year before the game's release by making the old Arwings behave accurately to a version of Star Fox 2 that players did not know about.
In the bonus level, "Chips and Dips", developer photos with humorous text can be found across the stage. A photo of producer Jeffrey Zwelling was found during gameplay by accident, and to date, the criteria to activate the picture is uncertain.
The series' in-universe Precursor language appears in several instances throughout the game, most notably in a series of Story cutscenes. During news broadcasts covering the racing tournament, a news ticker scrolling across the bottom of the screen produces a developer message from Naughty Dog when translated. The message says hello to the player and alludes to save data-based unlockable contents. However, an as-of-yet undiscovered secret is explicitly shared; the message does offer an input code, but to date, no use or purpose for it has been found.
Following the release of Ty the Tasmanian Tiger 3: Night of the Quinkan, development started on a fourth entry in the series titled "Ty the Tasmanian Tiger 4: Gunyip!". According to series co-creator Steve Stamatiadis, this game would have expanded upon the aerial combat sections featured in Ty 3, featuring a variety of Bunyip-inspired aircraft and factions, as well as both new and returning characters. It was ultimately cancelled around 2007 due to Krome Studios focusing their resources on developing ports for Star Wars: The Force Unleashed. Stamatiadis would later release a test reel of the game on his Tumblr page, which was later included as a piece of bonus content for Ty 3's PC remaster.
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Disk one includes a downloadable image file named ﾇﾘｴ.SR7, depicting lineart of Ranma's female form naked. An accompanying text file, ﾇﾘｴ.DOC, explains that this image is intended as an Easter egg for players, inviting them to use it as an impromptu coloring book.
In the April 1998 issue of Electronic Gaming Monthly's spin-off magazine EGM2, the issue's Trick of the Month was an alleged method to unlock Akuma from the Street Fighter series as a secret playable character in Resident Evil 2. In order to unlock him, the magazine instructed players to play through both story scenarios six times each using only the Knife and the H&K VP70 gun on hand at the start of the game, and achieve an A ranking in all scenarios. Once these specific conditions are met, the player would receive some kind of clue that would lead them to the security computer in the Laboratory on Level B5F. At this point in either scenario, players would type "AKUMA" instead of "GUEST" into the computer, and after entering it would be sent to the Save screen and given the option to make a new save file with Akuma's name. After starting this new file, the game would start with Akuma breaking out of a cryogenic tank in an unused area where Tyrants were originally planned to escape from, and make his way through the game without the use of keys, with his main attack being a red Gohadoken used just like a gun by holding the Action button and firing.
In reality, after going through these difficult unlock conditions, entering AKUMA into the computer will not unlock anything, because the trick was an elaborate April Fools' prank (with the exception of the unused Tyrant area, that was real). This prank was the work of EGM2 editor and art director Mike Vallas, who took assets from Street Fighter EX and heavily modified and photoshopped them into Resident Evil 2 gameplay screenshots. It was one of two proposed April Fools' pranks that were in consideration to appear in the main EGM magazine that month, being beaten out by a prank trick for GoldenEye 007 where you could play as previous James Bond actors. Unlike Akuma, they actually were planned to appear in that game, but can only be accessed with GameShark codes.
In 2013, Valve and the tabletop game company WizKids collaborated to produce an exclusive chess set themed around Team Fortress 2 that was sold on Valve's website and on ThinkGeek. Each copy of the set came with a digital code for a hat called the Grandmaster, where the head piece would change as your killstreak increases. Aside from "Grandmaster" being one of the highest titles awarded to chess players by the International Chess Federation, the hat's item description references a pair of highly publicized chess matches in 1996 and 1997 between former World Chess Champion Garry Kasparov, and IBM's chess-playing computer Deep Blue.
The expanded version of myPOPGOES has a challenge named "Mini-P," which makes pizzas cook faster, but restore less hunger. This is a reference to one of Scott Cawthon's characters from the 2015 troll game FNaF World: Halloween Edition, also named Mini-P, which has the appearance of William Afton's "Purple Guy" sprite, just smaller and with red glowing eyes.
One of Kage's item win poses features him throwing a pan into the air and it landing on his head. This is a reference to a secret win pose he had in Virtua Fighter 3tb.
Throughout development of Shipwrecked 64, Squeaks D'Corgeh would make references to a non-existent character in the game named "Duncan Dolphin". This even included a fake death animation for a character named "Drake Dulfin" (likely intended to be the Spoiler:Starling counterpart of Duncan) being shot in the face by Spoiler:Brandon Lester in his Bucky Beaver costume in what appeared to be a Wild West-esque setting. This continued after the game's release, where one of the patch notes for the Hotfix 2 update stated "Removed Duncan Dolphin", likely as a reference to the "Removed Herobrine" gag seen in updates to Minecraft.
However, on April 1st, 2024, an April Fools update was released that added Duncan to the game as a New Game+ bonus. If the game's True Ending has been reached, he will appear in The Theater at Midnight and ask Bucky for help activating his "New. Radical. Mechanism!!" due to losing the trinkets needed to make it work. This will take the player to a new area called "Garten of Duncan", a recreation of the Testing Sector from Garten of Banban made using assets from The Plaza. Clearing the map will take the player to a previously unused location called "Layer 4 Elevator", where an audio tape reveals that the player can input console commands to access other unused locations as part of the update. Entering the door will take the player to another new area, known simply as "Sample Area", but only a few seconds after entering the player will be kicked out to the encounter with the Spoiler:Studiogrounds Husk at the end of the game.
Notably, in the "Layer 4 Elevator" area, Chief Wulf can be seen on top of the tallest building in the area. If the player uses console commands to reach him, he can be spoken to, revealing that Spoiler:he has relived the same days over and over again, watched Stumbler O'Hare die over and over as part of that, and believes that he will be forgotten after his death.
Star Fox 64 3D features an entirely new battle multiplayer mode unique from the battle mode found in the original Star Fox 64, where up to 4 players can play a local multiplayer match via Download Play (or alternatively, battle against CPU opponents). However, the game did not support online play.
"Personally, I play a lot of online FPS games," began Amano. "This leads me to think that just making multiplayer parts of existing games playable online isn't enough to create a satisfying experience for users. The popular online games work in lots of things, so they play well online - and if we wanted to satisfy everyone who bought the game, the costs required for including online support would be vast.
For this project what we needed to do was use Star Fox to provide users with a game that shows the appeal of Nintendo 3DS as quickly as possible. We put a lot of effort into the graphics, and if we had included online support then we couldn't have reached this level in the time allowed."
In 2021, as part of a collaboration with the children's yogurt brand Danimals, Sonic Dash added brand mascot Bongo to the game as a playable character, unlocked by scanning a QR code on the back of Sonic Dash-branded Danimals products to download the game. This method could also be used to unlock the "Pirate Sonic" and "Captain Shadow" character variants, which could be earned by collecting all four birthday-themed items on the track, including a Danimals smoothie pack.
According to producer Kazuhisa Wada, the addition of the female protagonist from Persona 3 Portable was considered during development of Persona 3 Reload, but was ultimately deemed "too time-consuming and expensive" compared to remaking "The Answer", the epilogue chapter from Persona 3 FES.
The PlayStation 4 version of Ys VIII: Lacrimosa of Dana only had a few DLC costumes, which included the Silver Armour for Adol, the Eternian Scholar for Laxia, and the optional colour changes that Alison would prepare for the characters at a certain chapter in the game. The costumes themselves are references. Adol's Silver Armour is a reference to the default look he has had, most notably in the first and second Ys games and Ys: The Oath in Felghana, while Laxia's Eternian Scholar is directly based on the Eternians from Ys VIII itself.
For the Nintendo Switch port, more costumes were added for the 6 playable characters. All characters received the "Deserted Pirate" costumes, which follow on the theme of Pirates that were often mentioned up until the fight against Captain Reed in Ys VIII, while Adol, Laxia, Ricotta and Dana all receive "Tropical Swimwear" attire, which gives them swimsuits of various designs.
Sephiroth's inclusion as a DLC fighter was apparently so top secret that even certain members of Square Enix had not known that the villain was going to be included in Super Smash Bros. Ultimate until the corresponding show-stealing announcement at The Game Awards 2020 was made. Even Square Enix employee and Final Fantasy VII Rebirth director Naoki Hamaguchi was quite shocked and stated:
"[...] it was actually extremely confidential that he was even going to be in it, [...] So, none of the dev team knew, including myself. So it was more like when the whole world knew it, and that's when we knew it like, 'Oh, I had no idea!'"
When the Grey Faerie's Neopedia article was released, a "Bottled Grey Faerie" item was found in the game's servers. Neopian Times Editorial #90 would later imply that a plotline involving the Grey Faeries was on the way, however nothing has been heard about this since, likely meaning that whatever plotline was planned was either cancelled or delayed indefinitely.
Generica's holiday outfit is a reference to the outfit worn by Jack Skellington, the main character of the 1993 stop-motion animated film "The Nightmare Before Christmas". When given said outfit, she'll state "What's this? What's this? This outfit reminds me of a nightmare I had once, just before Christmas.", which not only alludes to the film's title, but also to the song "What's This?" from the film, which is sung by Jack when he first arrives in Christmas Town.
In the bonus level, "Chips and Dips", developer photos with humorous text can be found across the stage. A photo of producer Jeffrey Zwelling was found during gameplay by accident, and to date, the criteria to activate the picture is uncertain.
In the April 1998 issue of Electronic Gaming Monthly's spin-off magazine EGM2, the issue's Trick of the Month was an alleged method to unlock Akuma from the Street Fighter series as a secret playable character in Resident Evil 2. In order to unlock him, the magazine instructed players to play through both story scenarios six times each using only the Knife and the H&K VP70 gun on hand at the start of the game, and achieve an A ranking in all scenarios. Once these specific conditions are met, the player would receive some kind of clue that would lead them to the security computer in the Laboratory on Level B5F. At this point in either scenario, players would type "AKUMA" instead of "GUEST" into the computer, and after entering it would be sent to the Save screen and given the option to make a new save file with Akuma's name. After starting this new file, the game would start with Akuma breaking out of a cryogenic tank in an unused area where Tyrants were originally planned to escape from, and make his way through the game without the use of keys, with his main attack being a red Gohadoken used just like a gun by holding the Action button and firing.
In 2013, Valve and the tabletop game company WizKids collaborated to produce an exclusive chess set themed around Team Fortress 2 that was sold on Valve's website and on ThinkGeek. Each copy of the set came with a digital code for a hat called the Grandmaster, where the head piece would change as your killstreak increases. Aside from "Grandmaster" being one of the highest titles awarded to chess players by the International Chess Federation, the hat's item description references a pair of highly publicized chess matches in 1996 and 1997 between former World Chess Champion Garry Kasparov, and IBM's chess-playing computer Deep Blue.
Star Fox 64 3D features an entirely new battle multiplayer mode unique from the battle mode found in the original Star Fox 64, where up to 4 players can play a local multiplayer match via Download Play (or alternatively, battle against CPU opponents). However, the game did not support online play. 
In 2021, as part of a collaboration with the children's yogurt brand Danimals, Sonic Dash added brand mascot Bongo to the game as a playable character, unlocked by scanning a QR code on the back of Sonic Dash-branded Danimals products to download the game. This method could also be used to unlock the "Pirate Sonic" and "Captain Shadow" character variants, which could be earned by collecting all four birthday-themed items on the track, including a Danimals smoothie pack.
