The Dragon Quest-esque overworld area, colloquially known as FC World, features a large island on the right-hand side of the map that is not accessible during the normal course of play despite taking up the majority of FC World's land mass. No events or exits are associated with this island, popularly known as FC World C, meaning that hacking the game to place Madotsuki there would prove fruitless.
Despite this, there is evidence that this area was meant to be explorable at one point in development. In the Version 0.09 build (the last one before the "final" Version 0.10 release in 2007), the Dense Woods and Windmill World areas feature the player character from the minigame NASU as an NPC; however, a flag is set to render it invisible (and therefore non-interactable). If the player uses RPG Maker 2003's debugging tools to render the character visible, interacting with it teleports Madotsuki to another unused area in FC World, a small island with four statues on it and an exit at the bottom. Going through this exit takes Madotsuki to FC World C.
While FC World C is still as barren as in other versions of the game, the unused chain of events leading up to it in Version 0.09 indicates that the area was intended to play some kind of role in the final game and that Kikiyama continued to try implementing it late into the game's update history.
Certain in-game enemies are only able to be fought by Mario & Luigi or Bowser. Despite this, a few Bowser-oriented enemies have unique behaviors for Mario & Luigi, which can only be seen through hacking the game:
• All of Naplock's attacks can be dodged or countered by jumping, with its snot bubble attack also missing Mario & Luigi entirely even if nothing is done. • Dark Mechawful's punch attack can be countered with Mario & Luigi's hammers, while its countdown attack is replaced by the same star attack used by the Dark Mechawful head, which can fight Mario & Luigi in normal gameplay if Bowser inhales it. However, in a hacked Dark Mechawful fight, this attack progresses extremely slowly. • The smoke signals at the start of Choomba's charge attack are changed from fist and shell icons to "M" and "L" ones, indicating which brothers it will charge at and in which order; the attack can also be countered by hammering. • Dark Trashure's thrown items can be avoided or countered by jumping, similarly to its standard counterpart. However, the items move far faster than those thrown by a regular Trashure or a Dark Trashure fought by Bowser.
While most of these behaviors appear to be failsafes, Choomba is unique in that the "M" and "L" smoke signals are not present anywhere else in the game, indicating that at one point in development, Mario & Luigi would've been able to explore the Tunnel, where Choombas are fought.
Meanwhile, when hacking the game to allow Bowser to fight enemies that can only be encountered by Mario & Luigi, most of them will either crash the game, flee immediately, or display glitchy behavior. One unique case is Magifoofas, which can be inhaled by Bowser (despite the Vacuum Block not indicating this), indicating that the developers considered letting him encounter them in some form.
In an interview with the developers at Blue Tongue, they mentioned several buildings they wanted to include in this game, but had to drop due to design decisions or memory constraints on home consoles:
•Hotels, which would provide extra accommodation for guests. •Dino-Vet Station, which would have been vital for keeping dinosaurs healthy. •Hunting Platforms, which would let visitors hunt down carnivores in the park from afar.
The Dino-Vet Station can be found in earlier promotional material for Jurassic Park: Operation Genesis and also within its game files. Likewise with the Hunting Platform, which also still has Audio, Ini and even Rig Files within the game.
In the seventh episode of each course, the player is required to chase down and defeat Shadow Mario to obtain a Shine Sprite, which spawns from his dematerializing body as he teleports away. In actuality, the Shine Sprites are stored at fixed locations and are simply teleported to his location by the flag "appearShineFromKageMario". If the flag is replaced with "appearShineFromNPC", the Shine Sprites appear where they are stored, implying that these were their originally intended locations. The fixed points in "Shadow Mario Revisited", "Hold It, Shadow Mario!", and "Shadow Mario Runs Wild" also feature dedicated cameras for spawning cutscenes, corroborating the idea.
Of note is that the internal location for the Shine Sprite in "Shadow Mario Runs Wild" places it partially inside Pianta Village's golden mushroom, which further implies that this object had its height raised at some point during development.
Within the data for Pokémon Diamond, Pearl, and Platinum is code to spawn in a Level 40 Darkrai as a roaming Pokémon, tying in with its nature as a malevolent counterpart to Cresselia (which similarly becomes a roaming Pokémon after meeting the player on Fullmoon Island). In the final game, Darkrai is instead encountered as a stationary opponent at Newmoon Island after obtaining the Member Card as a Mystery Gift item at select in-person events.
There are eight Titanite Demons in Dark Souls, but the one on the bridge connecting the Demon Ruins to Lost Izalith is the only one that respawns due to a typo in that Titanite Demon's event ID. However, it's unknown if this was an accident or a deliberate typo to remove a limit from upgrading weapons.
There are fully functional unused Diggin' Chuck, Bullet Bill, Fishbone, and Spiny enemies in the code of Hummer Team's Super Mario World, as well as sprites for crushers, Lakitu, and Clappin' Chuck without associated coding.
The Saturn release's demo, "Silhouette Mirage: Trial Version", normally ends after level two. However, hidden on the game's disc is an early pre-release build of the retail game, dated 1997-07-16, while the final game has a build date of 1997-07-30. The full game is inaccessible without modifying the data.
Within the Saturn port's data is an unused English language option, suggesting that the title may have been considered for a Western release. Fan translator Malenko made the discover before creating a patch to re-enable the option.
Atari 2600's Asteroids has an unused functionality for showing graphics of the spaceship as a life counter instead of the number, much like the arcade version. This was most likely changed for processing power reasons, as only six ships can be displayed at a time.
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Within the game files, some of the game makers vented their annoyance over the game development process:
"I hate this game's coding. I can't see jack or shit of what's in it! Stream %d has read %d more bytes than the file size. Please tell Keith. If possible, save your debug output and mail it to him......Please also note the level on which it happened, how long you were playing for and what if any dialogue was playing Serious Shit. SOUNDSYS thread does not work.....SOUNDSYS secondary thread has started...Serious Shit. Second thread does not work request to free %d bytes of spu ram failed !!!!...things are shit. memory allocated above 2mb."
In the files of the Donkey Kong Adventure expansion, there are unused files for Rambi the Rhino as a party member, including a model; menu icons; and skills. He would have taken up two spaces on the board and been able to charge through any destructible terrain that enemies are using as cover and destroy it instantly. In the final DLC, Rambi would not appear physically in any form, but would have a gun made in his image. Rambi's model looks closer to his appearance in Rare's Donkey Kong games than his appearance in the Paon and Retro Studios Donkey Kong games, a design change that would also be carried over to Super Nintendo World's iteration of the character after Donkey Kong Adventure's release.
The matching card game has an unused card called "MatchPointsSadChef". It does not have any attached graphics. While this card doesn't exist, the game does have a happy chef card, using the chef from Comfy Cakes.
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, leftover data from the E3 2002 kiosk build, and as well as an unused audio file found within the retail release 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.
The Dragon Quest-esque overworld area, colloquially known as FC World, features a large island on the right-hand side of the map that is not accessible during the normal course of play despite taking up the majority of FC World's land mass. No events or exits are associated with this island, popularly known as FC World C, meaning that hacking the game to place Madotsuki there would prove fruitless.
Certain in-game enemies are only able to be fought by Mario & Luigi or Bowser. Despite this, a few Bowser-oriented enemies have unique behaviors for Mario & Luigi, which can only be seen through hacking the game:
In an interview with the developers at Blue Tongue, they mentioned several buildings they wanted to include in this game, but had to drop due to design decisions or memory constraints on home consoles:
Atari 2600's Asteroids has an unused functionality for showing graphics of the spaceship as a life counter instead of the number, much like the arcade version. This was most likely changed for processing power reasons, as only six ships can be displayed at a time.
In the files of the Donkey Kong Adventure expansion, there are unused files for Rambi the Rhino as a party member, including a model; menu icons; and skills. He would have taken up two spaces on the board and been able to charge through any destructible terrain that enemies are using as cover and destroy it instantly. In the final DLC, Rambi would not appear physically in any form, but would have a gun made in his image. Rambi's model looks closer to his appearance in Rare's Donkey Kong games than his appearance in the Paon and Retro Studios Donkey Kong games, a design change that would also be carried over to Super Nintendo World's iteration of the character after Donkey Kong Adventure's release.
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. 
