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Pokémon Black Version
subdirectory_arrow_right Pokémon White Version (Game), Yoshi (Game)
1
Attachment Within leaked source code for Pokémon Black and White uncovered by the Teraleak (a large-scale breach of internal server data from Game Freak in 2024) is an unreleased Nintendo DS remake of Yoshi, which according to the commit notes was intended to test multiboot functions for the two games. Various traits in the remake suggest that it was ported from a prior attempt at a Super Nintendo Entertainment System version instead of being made with the DS in mind: its name on the title screen is Super Yoshi no Tamago, while its copyright notice is listed as 1995 and credits Ape Inc., which had shut down in the same year. Furthermore, gameplay takes place exclusively on the bottom screen, and there are no touch control features present.

The remake only has one stage, an underwater level. Mario uses Jill's voice lines from Drill Dozer while Yoshi retains his modern voice. The game is also riddled with bugs, featuring corrupted title screen graphics, a nonfunctional mode selection screen, and a glitch where the game may lock up if certain button combinations are pressed. Due to the Teraleak only containing fragments of the Pokémon Black & White source code, it is unknown if these bugs reflect the state that Super Yoshi no Tamago was in when it was abandoned.
person Rocko & Heffer calendar_month October 15, 2024
Portal 2
1
In certain scenes in Portal 2, the player is required to quickly place a portal to get out of a dangerous situation. According to developer Dave Saunders, during playtesting, it was noticed that lots of players were dying during these segments because they placed the wrong color portals, so the developers specifically changed it so that clicking any button will result in the correct colored portal.
person Kirby Inhales Jotaro calendar_month September 24, 2024
Portal 2 - Chapter 9 Developer Commentary:
https://www.youtube.com/watch?v=0G9Y8jbSZb0#t=60s

Separate YouTube video with Developer Commentary captions:
https://www.youtube.com/watch?v=HWOnovl-B-w
Pokémon Legends: Arceus
1
Attachment Found within the game's data is an unused room depicting a modern-day bedroom, suggesting that there was supposed to be a cutscene showing the player before getting transported to the past.
Alien Resurrection
1
On December 19, 2023, programmer Martin Piper revealed a pair of hidden cheat codes he included in the original release of Alien Resurrection. To execute these codes, you need to go into the game's Options menu and unlock the Cheat Menu with the code Circle/Left on the D-Pad/Right on the D-Pad/Circle/Up on the D-Pad/R2. The cheats Piper revealed include the following:

• A level selection menu can be unlocked in the Options menu right after unlocking the Cheat Menu by pressing R1/Down on the D-Pad/R1/Right on the D-Pad/L1/Up on the D-Pad/L2/Square. If entered correctly, you will hear a "bonk" sound indicating the code has been activated. Re-entering the Cheat Menu will reveal an additional option to re-visit any section in any level in the game.

• The more notable of the two codes Piper revealed is one that allows the Alien Resurrection disc to act as a boot disc to play PlayStation games on any burned CD-R disc without the use of modding. This novelty method works with any PlayStation model (as long as you have something to block the tray disc sensor on newer models so you can swap out the disc with the tray open), and must be done after unlocking the level selection menu (you can save after unlocking this menu so you do not have to unlock it again if you want to perform the disc swap trick). Once that is unlocked, go back to the Options menu and enter the code Left on the D-Pad/Up on the D-Pad/Right on the D-Pad/Down on the D-Pad/Right on the D-Pad/Up on the D-Pad/Left on the D-Pad/Square/Triangle/Square/Triangle/L1. The "bonk" sound will again be heard if the code is activated. Next, go back to the Cheat Menu and set the level selection to Level 6 and Section 1. Then while highlighting Section 1, hold down L1 (Note: it's imperative to keep holding down L1 for the remainder of this method) and press X. The screen will turn black and the Alien Resurrection disc will stop spinning, at which point you can swap out the disc with a burned CD-R disc of any PlayStation game you desire. While still holding L1, hold Square and Triangle, and then release all three buttons to boot the burned CD-R game.

When asked by YouTube channel Modern Vintage Gamer, Piper revealed that the latter cheat code had never been disclosed to Sony when the game was sent in for certification as Sony would have immediately sent the game back and forced the developers to remove it since it acted as a backdoor for playing pirated games, and he believed that no other developers who worked on the game were made aware of it either. In a YouTube comment, he explained that he only revealed the codes now because it had been so long since the game's release and he did not want to hold onto the secret for the rest of his life. According to him, the intent of the feature stemmed from Alien Resurrection potentially being planned as a multi-disc game, with the feature being implemented as a test to see if discs could be changed without resetting the PlayStation. Unlike standard multi-disc games that function with the PlayStation's built-in ability to swap out discs through an API call to maintain memory data without fully resetting the console, Alien Resurrection has code that loads an .exe file on any burned CD-R disc you swap it out with to start that new game up while bypassing the PlayStation's anti-piracy protection check.
person MehDeletingLater calendar_month December 23, 2023
GamesRadar article:
https://www.gamesradar.com/after-23-years-developer-reveals-he-snuck-a-cheat-code-past-sony-that-turns-a-cult-classic-horror-game-into-a-godsend-for-retro-enthusiasts/

Video demonstrating the cheat codes (with link to Martin Piper comment):
https://www.youtube.com/watch?v=uRB7iUCX4KQ&;lc=UgxY-VgMjlsrZyWx01J4AaABAg.9yVrngKLtP59yVsLHbNHfR
Super Mario 64
1
The first-ever footage of Luigi as a playable character in Super Mario 64 was discovered through an old VHS tape in 2023. The footage was captured by a Japanese broadcaster recording footage of Nintendo's 1995 Space World trade show in Japan for a TV program covering the event. Despite this, the footage of Luigi is not actually the primary focus of the clip and as such can barely be seen at all. The video shows Luigi falling back down after performing a spin-jump in what appears to be a red and white test area.
Disney's Lilo & Stitch 2: Hämsterviel Havoc
subdirectory_arrow_right Hot Wheels World Race (Game), Ed, Edd n Eddy: Jawbreakers! (Game)
1
Attachment There exists an extremely early test prototype of Disney's Lilo & Stitch 2: Hänsterviel Havoc that is simply just a compilation of a platforming level from Ed, Edd n' Eddy: Jawbreakers and a racing level from Hot Wheels: World Race as a proof-of-concept that both styles of gameplay could fit in a single game pak. The only element of Lilo & Stitch that exists with in the game is Eddy's sprite in the Jawbreakers segment being replaced with Stitch.
The Oregon Trail
subdirectory_arrow_right The Oregon Trail (Game)
3
When The Oregon Trail was first being tested with 12-to-14 year olds at the Carlton College, the school faculty reacted negatively to offensive portrayals of Native American people in the game as tomahawk-wielding savages inspired by cowboy movies. While the developers of the game were initially offended by the prospect of changing the depiction, they eventually realized it was the right thing to do after questioning how an indigenous descendant would react to having to fight members of their race in the game.
Atari: 80 Classic Games in One!
1
Atari: 80 Classic Games in One! contains two unused ROMs created to test the emulators used in the compilation. Interestingly, the .txt file that contains the descriptions of all the featured games also has explanations of what these ROMs are, suggesting that they may have at one point been planned to be included as bonus content on the compilation for regular players:

"[colours]
What is this?
This ROM was created as part of the development
process for ^RAtari 80 Classic Games^0[sic]. This ROM
was transferred into a genuine first generation
Atari 2600 (bought by the lead programmer's
family back in 1977!) via a Cuttlecart. It cycles
through all the available colours in the Atari
2600 palette, displaying the colour's number as a
binary "bar code" at the top. The output of the
Atari 2600 was hooked up to a video capture card,
and each frame was digitised and its colour ID
determined by reading the bar code on the image.
All frames of the same colour were then averaged
together to get an average "RGB" colour value for
that number. This process was used to get accu-
rate colour matches with the original Atari 2600.
[sound]
What is this?
This ROM was created as part of the development
process for ^RAtari 80 Classic Games^0[sic]. This
ROM was transferred into a genuine first gener-
ation Atari 2600 (bought by the lead programmer's
family back in 1977!) via a Cuttlecart. It plays
a sound sequence consisting of a one second low-
volume beep, 1 second of silence, and then 4
seconds of a particular Atari 2600 "voice",
followed by another 1 second of silence. Each of
the available voices is played in turn at a
preset frequency. (Once all voices were played,
the frequency would change and the process would
repeat.) The output was captured via a PC's

^G(more...)
Page 2
^G(...more)

sound card and a program found the sound's
fundamental pattern. These captures were used
to generate accurate sound matches with the
Atari 2600.

Note: The left difficulty must be in the B
position for the sounds to start."
Sonic R
1
When Sonic R was first shown off at E3, many players gave up after running Sonic into the water and discovering how low his speed becomes - the first change game designer Jon Burton made to the game after that showing was increasing the speed velocity in the water.
Cheggers' Party Quiz
subdirectory_arrow_right Alan Hansen's Sports Challenge (Game)
3
Inside the code of Cheggers' Party Quiz and Alan Hansen's Sports Challenge, there are two unused test videos, unusually taken from the 2006 direct-to-DVD movie Bratz: Passion 4 Fashion Diamondz.
person Rocko & Heffer calendar_month November 11, 2023
Deus Ex
1
Valve co-founder Gabe Newell is credited in the game as an additional tester. More information on his involvement can be found in an extensive write-up by director and producer Warren Spector published by Gamasutra a few months after the game's release in 2000. Newell was the first of several industry friends (including developers from Looking Glass Studios and Irrational Games after him) to play-test and criticize the prototype missions they had ready in mid-1999, with Spector noting he "correctly identified the utter lack of tension" in the game's skill and augmentation systems, forcing them to completely change their design approach, with lead designer Harvey Smith revising them significantly for the final game.
person MehDeletingLater calendar_month February 16, 2023
The Legend of Zelda: The Wind Waker
1
Attachment There are a large number of incomplete and test rooms in the code for The Wind Waker. Among them, there are even completely functional areas which were simply removed from the final game for various reasons. While not accessible via normal means, they can be accessed via cheat devices like Action Replay.