In the original release of the game, the monster that the player could summon to attack the city was a thinly veiled parody of Godzilla, right down to using the character's iconic roar from the film series; the sound effect is even named "God" in the game's files, furthering the reference. The Godzilla parody is also depicted on the game's box art, gleefully waving at the viewer.
According to programmer Don Hopkins, who notably ported SimCity to numerous versions of Unix, Maxis ended up getting sued by Toho, the owners of the Godzilla franchise; additional details were recounted to him by Maxis CEO Jeff Braun:
"We never referred to the name Godzilla, our monster on the box cover was a T-Rex looking character, but... a few magazine reviews called the monster, Godzilla. That was all it took. Toho called it "confusion in the marketplace". We paid $50k for Godzilla to go away. In all honesty, Toho liked Maxis, they said $50k was the minimum they take for Godzilla infringement."
As a result of this suit, the monster was redesigned in the v1.2 release to resemble a giant orange salamander. The creature's roar is also changed and the game's box art is redesigned to replace the Godzilla parody with a tornado. In the v1.3 release, the salamander is given a slightly larger and more detailed sprite to fit the revised art style, but its roar (now internally renamed "Monster") is corrupted.
A major bug in The Witch and the Hundred Knight that can occur at seemingly any time will force the game to return to the system menu, losing all unsaved progress as a result. This became a common critique in the game's reviews, leading it to not be received as favorably by some. While The Witch and the Hundred Knight: Revival Edition did not fully fix this glitch, it occurs much less frequently, with playing for extended periods of time being noted as a possible factor.
When fighting the final boss Spoiler:Sigma, the music that plays in the fight, Spoiler:"Sigma 1st" (where the cloaked and uncloaked form fight occurs) & Spoiler:"Sigma 2nd" (where the final form fight occurs) is oddly swapped in the PC version of the game. This is due to mislabelled filenames, and can be easily fixed by manually swapping the filenames within the data for the PC version.
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.
The international logo for the game contains a tiny vectoring error at the bottom of the first "R" of "Riders". This mistake can't be seen on the title screen due to the lower resolution used, but it can barely be seen on the cover art for differing releases of the game.
In the PlayStation port, there are several death animation screens should the player get a "Game Over." However, these screens are left out in the Nintendo 64 version of the game.
The original release of the 1988 DOS version of Tetris features an animation on the title screen where a white Cessna airplane flies over the title logo; after the opening scroll, it reappears while dragging a banner that reads "PLAY TETRIS!" This sequence references Mathias Rust, a West German teenager who illegally piloted a Cessna from Uetersen Airfield to Moscow the previous year in an attempt to relieve tensions between the United States and Soviet Union, landing near Red Square.
Rust's flight was a major embarrassment for the Soviet military due to him disproving the notion that their defenses were ironclad. Consequently, later revisions of the game removed the animation on orders from ELORG, the Soviet Union's state-sponsored computer company and the owners of the Tetris license at the time.
Street Combat was originally released in Japan as Ranma ½: Chounai Gekitou Hen, a tie-in with the anime adaptation of Rumiko Takahashi's 1987 manga Ranma ½. The American release stripped out all references to the source material due to its obscurity in the United States at the time, though the in-game sprites for Street Combat's cast are visibly traced over their Ranma ½ counterparts. Additionally, Happosai and Cologne are merged into a single character, Happy, in Street Combat.
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In the PlayStation 4 and PlayStation 5 releases, Spoiler:Yuri's suicide is altered in order to comply with Sony's content guidelines. Specifically, Spoiler:her blood stains are changed from red to black, the animated blood splatters are replaced with static, the classroom background shifts to dark gray static, and the camera zooms in the first time she stabs herself. However, the following sequence, in which Spoiler:the player stays beside her corpse for several days, is unaltered.
Number World was not implemented until Version 0.08; in prior builds, the gray door in the Nexus with a large red circle on it instead lead to an early iteration of Lamp World. Of note is that the earlier version of Lamp World features an alcove full of beds and cupboards. A bloodstain is also present in the bottom-right corner of the room; in Version 0.07, this stain teleports Madotsuki to the Guillotine Room when stepped on. This alcove would be moved to the Number World in Version 0.08 onward, and the bloodstain would be replaced with a Zippertile spewing blood out of its mouth, still acting as a warp to the Guillotine Room.
Additionally, the early version of Lamp World featured background music that is not present anywhere in Version 0.08 onward; this track was also used for the Face Carpet area in Forest World before it was concurrently replaced in Version 0.08 with the background music for the hot springs building in the Wilderness, played at 70% speed.
In all earlier builds of the game, Neon World featured a radically different layout, matching the open-world structure of the other "main" locations accessible from the Nexus. The sole relic of this in Version 0.10's segmented design is the room that Madotsuki starts in, which is much bigger and features a more spread-out tile pattern compared to the other rooms in Neon World.
One noteworthy casualty from the layout change is the removal of various head-like figures scattered across Neon World in Version 0.09. These figures are not seen anywhere in Version 0.10, making them the only documented "characters" that were outright removed (rather than relocated) in a later update.
Within all available builds of the game are sprites for three possible effects that were never implemented. One set of sprites depicts Madotsuki blindfolded, another depicts a grayscale version of her similar to the "ghost" found in Mini Hell, and a third depicts 8-bit versions of the "crick in the neck," which in the final game is instead an event where Madotsuki randomly wakes up with her head stuck facing leftward. Of note is that Versions 0.07 to 0.09 additionally feature sprites for blindfolded and grayscale Madotsuki pinching herself awake; Version 0.10 overwrites them with the "active" sprites for the Spirit Headband effect.
Additionally, the game's data contains an unused mugshot depicting what appears to be an early iteration of the Spirit Headband effect, in which Madotsuki turns into a hitodama (a disembodied soul which appears as a floating ball of fire, comparable to a will-o'-the-wisp in many Western cultures) rather than becoming invisible. A full set of sprites for this version is also present in Version 0.04's data, showing that rather than turning invisible, pressing the 1 key would've simply changed the fire's color.
In the Japanese version, the test battle in the debug room features a proper background and models for the enemies included (borrowed from other enemies), whereas the international version simply pits the party against yellow pyramids in a black void.
Additionally, the very first Japanese release contains an unfinished eleventh section of the debug room, left over from an earlier build of the game. Because the game's code changed significantly since that build, much of the eleventh section is broken: Cloud's model does not show up (though he is still able to move around and interact with the NPCs there), text is corrupted, and the background music is a heavily distorted version of Aeris' theme.
The unpatched release of Version 0.10 contains unused data for an event on Mars called "階段←↓". Re-enabling this event opens an alternate, invisible entrance to the Martian underground, to the left of the hole that leads to it in the final game; however, the map's collision data prevents Madotsuki from actually using it without the aid of further cheats.
Furthermore, the game contains unused graphics for a stairway that matches the visuals of the Martian surface, and the Martian underground features several flights of stairs at the beginning. This indicates that the underground was originally meant to be accessed via the unused stairway rather than needing Madotsuki to activate the Midget effect, with the summit's layout being changed concurrently with the altered entrance. The Yumesyuusei Patch and all releases based on it (including the official English release) remove the data for 階段←↓, though the unused stair tiles are unaffected.
Additionally, the game's code contains tiles for doors on the walls of the Martian underground, indicating that the sub-area was originally planned to feature multiple rooms rather than just one. This, combined with the unused alternate entrance, implies that Kikiyama had to leave Mars incomplete for unknown reasons, polishing up what was already completed late into Version 0.10's development.
The English Steam release features a number of bugs not present in other editions:
• The lights do not dim when Madotsuki sleeps in the spaceship's bed, as the graphical filter is mistakenly set to transparent. • Certain sound effects, such as those for flying on the Witch effect's broom and talking to an FC Priori, do not play due to them being misnamed in the game's files. • If Madotsuki equips the Traffic Light effect, switches to the red light, and talks to the Toriningen that changes the UI's palette, the resulting text box is corrupted. This is because the correct text is displayed on another line that went untranslated.
Curiously, although the Steam release was updated four times to fix various other glitches and mistakes, none of the patches fixed any of these errors.
In the earliest builds of Yume Nikki, in-game text was not given windows outside of the game's menus; this feature was not added until Version 0.05. Curiously, while overworld text is generally sparse, Version 0.10 features data for a three-line window, far more than what is normally needed. This appears to line up with a text prompt in Version 0.04 – but not Version 0.06 onward – that appears when Madotsuki attempts to return the swivel chair to her desk in the dream world version of her apartment.
Because Version 0.05 is not currently available to the public, it is unknown if this window was indeed used for the prompt in that build or if the text was removed before the idea could be implemented.
Prior to Version 0.07, the guillotine NPC that provides the Severed Head effect when interacted with was located in Block World rather than the Guillotine Room (the latter of which is commonly known as such due to the guillotine's presence there in later builds). Instead, the latter area only features the lunatic Toriningen and cupboards.
This early iteration consequently made Block World one of only two areas in the game that featured more than one effect (the second being the Hat & Scarf effect, which is obtainable from Block World in all known builds). From Version 0.07 onward, this distinction is only held by Mural World (which features both the Blonde and Long Hair effects).
In the original release of the game, the monster that the player could summon to attack the city was a thinly veiled parody of Godzilla, right down to using the character's iconic roar from the film series; the sound effect is even named "God" in the game's files, furthering the reference. The Godzilla parody is also depicted on the game's box art, gleefully waving at the viewer.
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.
The international logo for the game contains a tiny vectoring error at the bottom of the first "R" of "Riders". This mistake can't be seen on the title screen due to the lower resolution used, but it can barely be seen on the cover art for differing releases of the game.
The original release of the 1988 DOS version of Tetris features an animation on the title screen where a white Cessna airplane flies over the title logo; after the opening scroll, it reappears while dragging a banner that reads "PLAY TETRIS!" This sequence references Mathias Rust, a West German teenager who illegally piloted a Cessna from Uetersen Airfield to Moscow the previous year in an attempt to relieve tensions between the United States and Soviet Union, landing near Red Square.
Street Combat was originally released in Japan as Ranma ½: Chounai Gekitou Hen, a tie-in with the anime adaptation of Rumiko Takahashi's 1987 manga Ranma ½. The American release stripped out all references to the source material due to its obscurity in the United States at the time, though the in-game sprites for Street Combat's cast are visibly traced over their Ranma ½ counterparts. Additionally, Happosai and Cologne are merged into a single character, Happy, in Street Combat.
Number World was not implemented until Version 0.08; in prior builds, the gray door in the Nexus with a large red circle on it instead lead to an early iteration of Lamp World. Of note is that the earlier version of Lamp World features an alcove full of beds and cupboards. A bloodstain is also present in the bottom-right corner of the room; in Version 0.07, this stain teleports Madotsuki to the Guillotine Room when stepped on. This alcove would be moved to the Number World in Version 0.08 onward, and the bloodstain would be replaced with a Zippertile spewing blood out of its mouth, still acting as a warp to the Guillotine Room.
In all earlier builds of the game, Neon World featured a radically different layout, matching the open-world structure of the other "main" locations accessible from the Nexus. The sole relic of this in Version 0.10's segmented design is the room that Madotsuki starts in, which is much bigger and features a more spread-out tile pattern compared to the other rooms in Neon World.
In the Japanese version, the test battle in the debug room features a proper background and models for the enemies included (borrowed from other enemies), whereas the international version simply pits the party against yellow pyramids in a black void.
The unpatched release of Version 0.10 contains unused data for an event on Mars called "階段←↓". Re-enabling this event opens an alternate, invisible entrance to the Martian underground, to the left of the hole that leads to it in the final game; however, the map's collision data prevents Madotsuki from actually using it without the aid of further cheats.
The English Steam release features a number of bugs not present in other editions:
In the earliest builds of Yume Nikki, in-game text was not given windows outside of the game's menus; this feature was not added until Version 0.05. Curiously, while overworld text is generally sparse, Version 0.10 features data for a three-line window, far more than what is normally needed. This appears to line up with a text prompt in Version 0.04 – but not Version 0.06 onward – that appears when Madotsuki attempts to return the swivel chair to her desk in the dream world version of her apartment.
Prior to Version 0.07, the guillotine NPC that provides the Severed Head effect when interacted with was located in Block World rather than the Guillotine Room (the latter of which is commonly known as such due to the guillotine's presence there in later builds). Instead, the latter area only features the lunatic Toriningen and cupboards.