The game’s files have four .txt files titled DEUTCH.TXT, ENGLISH.TXT, ESPANOL.TXT and FRENCH.TXT, suggesting German, Spanish and French versions were planned for the game. In the end, only an English version exists.
While Flashing Eggs make cameos in the Secret Level "Yoshi's Island Easter Eggs", they are out of Yoshi's reach due to them being embedded in the ceiling at the start of each room. Hacking the game to let Yoshi use them shows that they are fully coded and retain their functionality from Super Mario World 2: Yoshi's Island, producing a Red Coin when thrown at an enemy or Winged Cloud.
Star Fox Adventures contains a peculiar character named the WarpStone, a living stone creature that has the ability to warp users to the top of Ice Mountain and also Krazoa Palace, where Fox will need to deposit all of the six Krazoa Spirits he acquired through partaking through the Krazoa's trials in order to save Krystal, who is imprisoned at the top of the Palace. Underneath the WarpStone also lays the Game Well Maze, where Fox can deposit any of the Cheat Tokens he's collected from Scarab Wells hidden in the map throughout his Adventures to unlock extra features and also cryptic messages.
In Dinosaur Planet, the WarpStone was originally meant to be two different characters, the SwapStone twins known as Rocky and Rubble. Hence their name, their original purpose was to let the player be able to switch back and forth between Sabre and Krystal's adventures. Sabre would utilize Rocky in an area called SwapStone Hollow, while Krystal would utilize Rubble in her equivalent, SwapStone Circle (which is also where the LightFoot Village was situated). Both characters would also retain the ability to warp their respective character to Warlock Mountain (the predecessor to SFA's Krazoa Palace) where the characters could similarly deposit the Krazoa spirits they acquired from the Krazoa shrines. Underneath the SwapStones was the only in-game store where Sabre and Krystal could purchase items, maps, etc. Curiously, their bio claims that they were created during the age of the Krazoa, by being mined from the magic rock of Warlock Mountain, and that they assisted in the creation of the Force Point Temples and the Krazoa shrines.
As Krystal's playable co-protagonist role was scrapped in SFA outside of the prologue, the SwapStones were merged into one character, the WarpStone, and SwapStone Hollow was renamed to ThornTail Hollow. SwapStone Circle would be effectively removed, but the LightFoot Village segment was heavily expanded into its own distinct area. In place of being able to swap to Krystal, Fox could be teleported back to the top of Ice Mountain where he could replay the jet bike race against the SharpClaw. While early design documents and leftover data from the E3 2002 kiosk build of SFA indicate that the store was still planned to be located underneath the WarpStone, in the final game it was relocated to the middle of ThornTail Hollow as its own distinct establishment, the ThornTail Store, and the alformentioned Game Well Maze took its original intended spot.
Diving in to the game files, it seems Rare had also intended on letting the WarpStone teleport Fox over to additional areas such as Cape Claw, Moon Mountain Pass, and the Force Point Temples, but this was scrapped and currently, the WarpStone can only warp you to Ice Mountain and Krazoa Palace.
The Noise, Pepperman, and The Vigilante were all planned to be playable at some point - Vigilante and Noise were both intended to be regular playable characters, while Pepperman was intended as a one-level only character on Refrigerator-Refrigerador-Freezerator, much like Gustavo & Brick. All 3 of them have code and animations left over in the game, of varying compatability. The Noise would later be re-added in a future update due to all of his animations being completed.
In 2013, a Kingdom Hearts online mobile game was in development that never saw the light of day. It was to be called "Kingdom Hearts: Fragmented Keys". The game was rumored to feature customizable avatar characters (like Union Cross). It would also have been in 3D instead of Union cross' 2D art style. Most interesting and exciting of all though (gathered from concept art no less) was the Disney world list as the game would feature returning worlds like: Agrabah, Wonderland, a Lilo & Stitch Hawaii world, Space Paranoids/The Grid, London/Neverland, and Dwarf Woodlands. It also included worlds that didn't appear in the series yet but would appear in later games like Union Cross and Kingdom Hearts III, such as: Arendell (Frozen), Kingdom of Corona (Tangled), and Niceland/Game Central Station (Wreck-It Ralph). Finally, and most shockingly, a world based on the Star Wars franchise, although this world's chronology is unknown as concept art show different conflicting eras, such as an image of characters Anakin, Obi-wan, Padme, and Master Yoda in their exact looks from Star Wars: The Clone Wars movie and series in a separatist gunship's hanger as well as a planet that looks similar to Tatooine and an anachronistic Death Star power station room. It is unknown why this game was cancelled.
If one moves Hank's Microsoft Agent actor file into the the main Microsoft Bob application, he can be used as a main Bob assistant, complete with his own character bio, suggesting that he was meant to be part of the wider Microsoft Bob program. Some of his text is generic placeholders and he does not have a background (instead using a close-up of what appears to be his knee or elbow).
Pregnancy was supposed to be a condition in Theme Hospital. It is somewhat finished and can be restored with modding, but lacks graphics and is referred to as a "disease".
In the Game Boy Advance version of Harry Potter and the Prisoner of Azkaban, there is an unused minigame that is just a clone of Tapper, with Pumpkin Juice in place of beer.
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All of the songs in Animorphs for the Game Boy Color have an internal title. While most of these are descriptive of either the song or its context, some are vulgar in nature and one even includes a slur - those being SHATURATOR, SHITSACK, and FAGGAGS.
Additionally, WORLD1 refers to the jingle at the start of a mission instead of a world 1 theme, and INTROA is one of the battle songs instead of an intro theme.
According to Raww Le Klueze, global admin of the Suikosource forums, there is a hidden marriage proposal spoken by The Castle Keeper zombie in Neclord's castle that can be found in the game's files in ve3.bin and ve6.bin. There is no known way to access it in-game. Translated to English, it reads:
"Kazuko I really love Kazuko Even after 10 years Even after 20 years Even after 50 years I will always, always love her. ......... Teeheehee! Thank you for always being there. And for always supporting me! PS Let's get married! Mwah!"
It's unknown who Kazuko is or who wrote this proposal. This text is only believed to be present in the Japanese version of the game, with the North American version replacing it with a repeat of some past dialogue with the zombie before ending with the "Mwah!" replaced with a single "Yuk.".
Sonic Origins contains leftover data from the then-unreleased Sonic Frontiers. This is how it was first discovered that Big the Cat and his fishing minigame would return in Frontiers.
There are four unused cheat codes in Plok! that were disabled, each of which spells a word with the inputs of the SNES controller, and displays a message on screen. These were disabled, and therefore cannot be used under normal means:
• Right - Up - B - B - A - Down - Up - X (Rubber Ducks) - Displays "NINTENDO POWER" and warps the player to the Test Level • Y - A - B - A - Down - A - B - A (Yaba Daba) - Displays "JOHN'S CHEAT" and gives the player 16 Buddy Hornets • B - Right - Up - X - Y - A - Left - Left (Brux Y'all) - Displays "LYNDON'S CHEAT" and gives the player 160 shells • Up - Right - B - A - Down - Left - A - Down (You're Bad, Lad) - Displays "BAD INFLUENCE!" and makes the player invincible for 13 seconds
Nintendo Power and Bad Influence are both the names of 90s-era gaming publications, meaning that there may have been an intent to share the codes through those platforms.
"John" is likely referring to Plok! co-creator John Pickford, while "Lyndon" and his code "Brux Y'all" refers to game designer and sprite artist Lyndon Brooke.
Plok! did not feature any rubber ducks, however, a later Pickford Bros. game, Wetrix, would, and the eventual Plok! the Exploding Man comic would feature the rubber duck from Wetrix as a main protagonist.
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Many of the internal object names in Crash Bandicoot: Warped, particularly those of the lab assistants, are profane in nature, such as:
• obj_asshole (the lab assistant who hides in a hole in the Chinese levels) • obj_stonedass (the lab assistant who lifts bricks in the Chinese levels) • obj_willy#you_fuck (Crash's biker outfit model) • obj_box_spring_iron#mother_fucker (A specific Iron Bounce Crate on Hang'em High) • obj_block#mother and obj_block#fucker (sliding blocks on the oil floor in Sphynxinator)
Inside the code for the SNES version of Daze Before Christmas are a set of mostly Christmas-related quotes and messages:
Any dramatic game the producers want us to take seriously as a representation of contemporary reality cannot be taken seriously as a representation of anything -- except a game to be ignored by anyone capable of sitting upright in a chair and chewing gum simultaneously. -- Richard Schickel (slightly modified)
... Now you're ready for the actual shopping. Your goal should be to get it over with as quickly as possible, because the longer you stay in the mall, the longer your children will have to listen to holiday songs on the mall public-address system, and many of these songs can damage children emotionally. For example: "Frosty the Snowman" is about a snowman who befriends some children, plays with them until they learn to love him, then melts. And "Rudolph the Red-Nosed Reindeer" is about a young reindeer who, because of a physical deformity, is treated as an outcast by the other reindeer. Then along comes good, old Santa. Does he ignore the deformity? Does he look past Rudolph's nose and respect Rudolph for the sensitive reindeer he is underneath? No. Santa asks Rudolph to guide his sleigh, as if Rudolph were nothing more than some kind of headlight with legs and a tail. So unless you want your children exposed to this kind of insensitivity, you should shop quickly. -- Dave Barry, "Christmas Shopping: A Survivor's Guide"
I stopped believing in Santa Claus when I was six. Mother took me to see him in a department store and he asked for my autograph. -- Shirley Temple
An idea for Elephant Mario once involved inflating a Koopa Troopa shell thus allowing Mario and friends to carry it around with them. The idea got shot down after developers had trouble knowing what to do with them. A remnant of the idea still exists in-game, allowing Elephant Mario to carry large objects that are already on the stage.
The arcade version of Rise of the Robots contains code from an unreleased arcade version of Zool. However, this is only a file directory and as such unfortunately cannot be reverse-engineered into a playable state.
The SNES versions of Beethoven: The Ultimate Canine Caper! and Tom & Jerry both contain a dummy text file from the SNES version of The Hunt for Red October.
IN NOVEMBER OF 1984, SHORTLY BEFORE GORBACHEV CAME TO POWER, A TYPHOON- CLASS SOVIET SUB SURFACED JUST SOUTH OF THE GRAND BANKS. IT THEN SANK IN DEEP WATER, APPARENTLY SUFFERING A RADIATION PROBLEM. UNCONFIRMED REPORTS INDICATED SOME OF THE CREW WERE RESCUED. BUT ACCORDING TO REPEATED STATEMENTS BY BOTH SOVIET AND AMERICAN GOVERNMENTS, NOTHING OF WHAT YOU ARE ABOUT TO SEE... ...EVER HAPPENED.
When SpongeBob is on-stage in Nickelodeon All-Star Brawl, he automatically activates a code titled "yummerSummon" - this does absolutely nothing, and serves as a comical reference to an infamous unused graphic in SpongeBob Saves the Day! for dataminers to discover. The Yummer graphic is not known to exist in All-Star Brawl.
While Flashing Eggs make cameos in the Secret Level "Yoshi's Island Easter Eggs", they are out of Yoshi's reach due to them being embedded in the ceiling at the start of each room. Hacking the game to let Yoshi use them shows that they are fully coded and retain their functionality from Super Mario World 2: Yoshi's Island, producing a Red Coin when thrown at an enemy or Winged Cloud.
Star Fox Adventures contains a peculiar character named the WarpStone, a living stone creature that has the ability to warp users to the top of Ice Mountain and also Krazoa Palace, where Fox will need to deposit all of the six Krazoa Spirits he acquired through partaking through the Krazoa's trials in order to save Krystal, who is imprisoned at the top of the Palace. Underneath the WarpStone also lays the Game Well Maze, where Fox can deposit any of the Cheat Tokens he's collected from Scarab Wells hidden in the map throughout his Adventures to unlock extra features and also cryptic messages. 
In 2013, a Kingdom Hearts online mobile game was in development that never saw the light of day. It was to be called "Kingdom Hearts: Fragmented Keys". The game was rumored to feature customizable avatar characters (like Union Cross). It would also have been in 3D instead of Union cross' 2D art style. Most interesting and exciting of all though (gathered from concept art no less) was the Disney world list as the game would feature returning worlds like: Agrabah, Wonderland, a Lilo & Stitch Hawaii world, Space Paranoids/The Grid, London/Neverland, and Dwarf Woodlands. It also included worlds that didn't appear in the series yet but would appear in later games like Union Cross and Kingdom Hearts III, such as: Arendell (Frozen), Kingdom of Corona (Tangled), and Niceland/Game Central Station (Wreck-It Ralph). Finally, and most shockingly, a world based on the Star Wars franchise, although this world's chronology is unknown as concept art show different conflicting eras, such as an image of characters Anakin, Obi-wan, Padme, and Master Yoda in their exact looks from Star Wars: The Clone Wars movie and series in a separatist gunship's hanger as well as a planet that looks similar to Tatooine and an anachronistic Death Star power station room. It is unknown why this game was cancelled.
If one moves Hank's Microsoft Agent actor file into the the main Microsoft Bob application, he can be used as a main Bob assistant, complete with his own character bio, suggesting that he was meant to be part of the wider Microsoft Bob program. Some of his text is generic placeholders and he does not have a background (instead using a close-up of what appears to be his knee or elbow).
In the Game Boy Advance version of Harry Potter and the Prisoner of Azkaban, there is an unused minigame that is just a clone of Tapper, with Pumpkin Juice in place of beer.
An idea for Elephant Mario once involved inflating a Koopa Troopa shell thus allowing Mario and friends to carry it around with them. The idea got shot down after developers had trouble knowing what to do with them. A remnant of the idea still exists in-game, allowing Elephant Mario to carry large objects that are already on the stage.
