Due to a programming error, the player has a random chance of accessing debug mode in Super Mario Bros. 3 (specifically the one from the NES version of the game, which is carried over to the Super Mario All-Stars port). The debug mode only activates if a value of 80 is stored at the RAM address 7E0160, which can be manually edited by a devkit.
The NES version initializes the equivalent RAM address to 00 whenever the game is turned on, preventing the player from encountering debug mode during the normal course of play. However, due to an oversight, this does not occur in the SNES version, resulting in Super Mario All-Stars reading whatever value is generated by the console itself. Because this value is randomized during bootup, this means that the game has a small chance of activating debug mode in Super Mario Bros. 3 on a retail unit. While the theoretical probability of this occurring is 1/256, it can vary depending on the console's build and the power grid that it is connected to.
According to Suikosource user JiN88, the Japanese demo of Suikoden II contains two debug/testing rooms.
The first test room claims to be in Radat Town, despite seeming to be in Kyaro Town. The room contains various warping and unfinished textures, out-of-place objects like barrels, and two non-functioning Warp points. Of the warp points, one can be found down near a river and loads nothing, while the other can be found near a bridge with an Anita NPC and some invisible objects. While this test room seems to be empty, except for one small area featuring several invisible objects, a pushable tree that you can talk to, and a row of NPCs that can be pushed, but cannot be interacted with without crashing the game. There are also two Gabocha NPCs, one of which can warp you back to somewhere else in the test room, while the other has some dialogue and acts like a shopkeeper. Finishing the conversation with the shopkeeper Gabocha will cause the game to crash. Interacting with any Anita NPC will cause the game to crash.
The second test room contains several repeating groups of Anita, Gengen, and Old Man NPCs in a sort of army formation. The name of this second debug room is "神様の村" which means "Village of God"/"God's village". Talking to the Anita and Gengen NPC groups will have them say a single line of dialogue (the Anitas however will have no text), and once finished will cause the game to try and load something, which results in the game crashing. It's thought that they would try to warp you somewhere with a cutscene. Raww Le Klueze, global admin of the Suikosource forums, has translated this room's dialogue as such:
"The Gengens each say: • "I am the sound change god" • "I am the sound test god" • "I am the window change god" • "I am the unit change god" (for this phrase, he uses the same word as Apple does when you rearrange war units)
Some of what the Old Man says follows the same format "I am the god of !" in the middle row Library, Suggestion box, Restaurant, Cooking Battles, Guardian Deity and Peeping...? (He also laughs after that one. Bath scenes maybe?)
Top says "The detective god is here!" Bottom "Fishing god here!" "I'm the god of tablets" (same word as the plates found in the Sindar ruins, presumably tests that?)
Last one on the bottom I don't know, he just seems to be making noise cause it just says BABANBABANBANBAN - HAAPIBANONO."
This latter piece of dialogue might be a reference to the song "Nice Hot Water", a 1966 song in the "Nihon no Uta" Japanese local song series that was famously covered by the Japanese comedy rock band The Drifters. The first line before the hyphen is the same as the song, and the second line after the hyphen is almost the same as the song.
Adding the line "Charmy_Shutup 1" to "%AppData%\SEGA\SONICHEROES\sonic_h.ini" on the PC version will deactivate all non-subtitled speech from the characters during gameplay (including attacks and idle quotes).
Likely a leftover feature from debug testing, a code could be activated in earlier versions of the game that can instantly kill the characters by holding ZL/ZR/L/R/X/D-Pad Down for around 5 seconds. It could also be activated in the middle of cutscenes or while talking to NPCs. This code was removed in version 2.1.0 of the game.
The iconic start-up sound of the PlayStation is actually a combination of three different clips stored in the system BIOS, which are then either sped up or slowed down to produce what is heard at the boot-up screen. These sounds also serve to check if the system is running normally and is OK to read games - errors within the system can lead to the startup sound becoming distorted.
As a way of preventing the use of a cheat device like Game Genie, additional code was put in place to detect one. If the system discovers any sort of leftover data in its RAM and VRAM, the game will lock-up and display a gray screen. This was done due to the game being released as part of a contest run by MTV.
The Gamecube disc for Pikmin actually contains a Windows executable file. When run on a computer, the game will launch in a very glitchy state. In the game's debug menu is a mode titled "Game-Mode". Enabling this mode will fix several issues.
Aeris, after being brought back via a cheat device, has dialogue in discs 2 and 3. This seems to imply that either Spoiler:she was not meant to die at the end of disc 1 or that Spoiler:she was intended to be revived later in the game.
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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."
On September 11, 2022, several cheat codes were discovered in the game by a user on game wiki The Cutting Room Floor. The list of codes that have known functions prior to December 2023 are as follows:
• On the Options menu, by pressing Circle/Left on the D-Pad/Right on the D-Pad/Circle/Up on the D-Pad/R2, you can unlock a Cheat Menu with basic toggles for Infinite Ammo, Infinite Health, No Chestburst and No Drown. All four of these options have dedicated cheat codes which are listed below:
• L1/L2/Up on the D-Pad/L1/L2/Up on the D-Pad/Circle = Dedicated Infinite Ammo code, can have unlimited ammo with weapons you can have at selected point in the game. • R1/R2/Down on the D-Pad/R1/R2/Left on the D-Pad/Square = Dedicated Infinite Health code. • R1/L1/Left on the D-Pad/R1/L1/Square/Down on the D-Pad = Dedicated No Chestburst code. • R2/L2/Right on the D-Pad/R2/L2/Circle/Down on the D-Pad = Dedicated No Drowning code.
Remaining miscellaneous cheat codes that can be activated include:
• L1/Circle/Square/L1/Down on the D-Pad/Up on the D-Pad/Circle = Have weapons you can have at selected point in the game. • R1/Square/L2/L1 = Selecting quit warps you to section 0 of selected level. • R1/Triangle/Square/L1 = Quit functions as a restart. • Triangle/L1/R1/Square/L1/R1/L1/Square = Press L2 + L1 to display debug information while in-game.
As of December 2023, there are three codes that have unknown functions:
Zener Works was originally working on a game for the Panasonic M2 prior to that system's cancellation. Sony would later contact them in June 1997 about making a game for the original PlayStation, thus leading to Okage's development. However, the project was moved to the PlayStation 2 per Sony's request the day before they announced their next-generation console on March 1, 1999. This lead to the graphics and coding being redone in order to be compatible with the Emotion Engine. Programmer Yasushi Takeda noted that debugging proved to be a challenge due to the company working with the console in an early state, and the appropriate tools not being available.
The section for passwords in the manual for Wario Blast shows an image of the game's title screen with a debug code (2264) that lets the player start the game with all power-ups as Wario. It is unknown if this was an oversight, or intentionally included.
The NES and SNES versions of Super Mario Bros. 2 contain different insta-kill cheat codes, likely used by the game's developers for debug purposes. The code for the NES version involves pausing the game and holding Up/A/B on a second controller, and then unpausing to lose a life. The code for the SNES version is simpler, where you only need to pause the game, hold L and R, and then press Select to lose a life.
There are a pair of glitches that can be triggered with this code in the NES version. If the code is inputted while riding a Rocket, the health bar will effectively turn invisible by displaying all the heart pips as empty, but the player character will emerge unharmed. If the code is inputted during the transition for walking through a door, the player character will continually fall through the floor and lose their lives until a Game Over is reached.
On December 24, 2022, an anonymous user on the Internet Archive uploaded the source code for Rayman 4, the original prototype for what would later become Rayman Raving Rabbids. The Rayman 4 prototype, which was known to be a 3D Platform game with beat'em up elements that involved the Rabbids as the game's antagonists, showcases several interesting features. Some of the content featured in the E3 2006 trailer can be found in the prototype such as rideable animal companions, interchangeable costumes, combat gameplay, and explorable settings such as a forest, cave, & gear temple.
Some newer never-before-seen content includes: • Early unfinished cutscenes some featuring a witch doctor from Rayman 3: Hoodlum Havoc. • Explorable Rabbid bases/lairs with programmed Rabbid enemies. • Rayman utilizing several projectile weapons. • Other explorable worlds such as a village setting and a sphincter-inspired level. • Rayman controlling Rabbid vehicles such as a hovercraft and large robots. • When receiving damage, Rayman loses his clothing except for a leaf covering. This costume was repurposed as the Rayomz skin in Rayman Legends seven years later.
An unused exit screen with the label "underconstruction_exit" exists within the game files. When activated in-game, the level will abruptly end and transition to the boss variation of the level's stage.
Unlike its Wii counterpart, characters such as Zephyr, Nimbus, and the Wind Warrior use two separate models in the Xbox 360 and PlayStation 3 ports of the game.
The first model is used during fly-through cinematics while the second one is used in-game. The Wii version only used one model, presumably because of the lack of resources on the Wii's hardware.
Through the use of Action Replay codes, it's possible to die on the Level Select map. When this happens, Pac-Man will respawn on the game's title screen; moving around will reveal a stool and fishing rod off-screen, suggesting that he was originally planned to fish on the title screen instead of just standing and playing idle animations.
In 2021, the game's debug menu was discovered on a demo disc and was later executed in the retail version through the creation of a GameShark code. The menu contains four options featuring the surnames of four of the game's programmers (most likely to test out certain aspects of the game each one focused on more easily): Satoshi Kishiwada, Yasuhiro Yamamoto, Tamotsu Goto, and Naoto Uenaka.
Additionally, by selecting "Area 7 Action" and "Scene 06 - Last-Scene", you can access a beta version of the crumbling Soda Fountain, the final area of the game Spoiler:where Musashi battles against Dark Lumina, lacking textures and featuring an overhead camera compared to the sidescrolling camera in the final game.
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The game contains a lot of debug text, starting at offset 0xC6370 and mixing with the rest of the game's text. Of note, two dates appear in the debug text that may be the dates the game finished development in North America and Europe:
North America: Jun 6 1997.21:45:51 Europe: Nov 17 1997.20:23:27
The rest of this submission contains a few examples of the debug text scattered throughout the ROM. Most of it is routine stuff, but there are some interesting gems in there. The developers were certainly not in a good mood or this was "kinda" a joke from them. Note that "tell dave" likely refers to David Pridie, one of the programmers:
"*** GAME CRASH CONFIRMED!!! ***
ERRRRRRORRR
*** WARNING! generatelevel.c -> PlacePiece is going to plot z+1!
*** ERROR! generatelevel.c -> PlacePiece did not function to avoid breaking a piece!
According to Suikosource user JiN88, the Japanese demo of Suikoden II contains two debug/testing rooms. 
In the level "Cloud Spires" is a secret purple Gem inside one of the clouds. It's not normally possible for the player to reach this location.
The section for passwords in the manual for Wario Blast shows an image of the game's title screen with a debug code (2264) that lets the player start the game with all power-ups as Wario. It is unknown if this was an oversight, or intentionally included.
Through the use of Action Replay codes, it's possible to die on the Level Select map. When this happens, Pac-Man will respawn on the game's title screen; moving around will reveal a stool and fishing rod off-screen, suggesting that he was originally planned to fish on the title screen instead of just standing and playing idle animations.
In 2021, the game's debug menu was discovered on a demo disc and was later executed in the retail version through the creation of a GameShark code. The menu contains four options featuring the surnames of four of the game's programmers (most likely to test out certain aspects of the game each one focused on more easily): Satoshi Kishiwada, Yasuhiro Yamamoto, Tamotsu Goto, and Naoto Uenaka.