If the player enters Threed's circus tent and repeatedly uses the Check command on the rightmost corner, the game will glitch in a variety of unpredictable ways. The most minor of these outcomes involves a short delay in when the "No problem here." text box is thrown up, while more major results can escalate into full-scale corruptions; most results involve the text box spewing garbage data. The reason for these phenomena is because of a programming oversight: the game stores every map in a single file that players are transported around via warps. However, the corner where the glitch occurs contains a gap in the room's boundaries, enabling the player to use the Check command on out-of-bounds areas that the game was not programmed to read.
Following its discovery, the bug, popularly known as the "Threed Tent Glitch" and the "Check Area Glitch," became a key asset for speedrunners, as one possible effect gives players access to a debug menu, from which they can warp directly to the game's epilogue. Its utility only further increased after players discovered that it can be triggered very early in the game by using additional glitches to reach the top-right corner in Onett's map, which similarly gives access to an out-of-bounds area.
Instead of pressing Select to exit any stage you have already finished, it is possible to exit any stage before clearing it by pausing and using the following cheat code: Right+Y/Left+A/Up+B/Down+X. While some ROMhackers claimed to have been previously aware of the code, it appears that it did not become more widely known by players until it was rediscovered by a programmer going through the game's data in 2024. It's believed that this code was implemented during development to prevent softlocking and was never meant to be discovered by players.
Following the shutdown of Nintendo Network on April 8, 2024, two players by the user handles of Marioiscool246 and Fishguy6564 attempted to stay connected to the service in some form by activating online multiplayer in Mario Kart 7 and playing for as long as possible. The campaign, which originated as a way to determine how Nintendo Network functionality is disabled for a given title, used bots and a custom patch to keep the pair's 3DS systems connected and active.
While Marioiscool246's 3DS eventually froze after just over a month, Fishguy6564 remained live for substantially longer, with his own system not crashing until November 3, 209 days later. In doing so, he broke the record for the longest recorded time spent in post-shutdown online multiplayer, surpassing both the 25-day stretch held by Halo 2 player APACHE_N4SIR in 2010 and the 68-day Splatoon marathon conducted by Lcd101 earlier in 2024.
There are two unused pieces of headgear in the files of the original Nintendogs games: a chonmage wig (a Japanese male ponytail haircut worn by samurais in the Edo period to hold their helmets in place), and an afro wig. The chonmage has an unused description found in the Japanese version of the games and had all of its assets in the international releases replaced with the data for the Rainbow Wig. The afro on the other hand was finished enough that you can use cheat codes to make a dog wear it, but it does not have any leftover text or item attributes that let it be obtained as an item. It may have been cut from the games late into development due to concerns over racial offense and replaced with the Rainbow Wig, which has a very similar appearance to the afro, but with a rainbow-colored texture instead of one resembling black hair.
At any time during gameplay, a cheat code can be activated as many times as needed to receive one free medicine bottle, allowing players to stock up on as many health items as they need to get through the game. This was most likely not meant to be seen by players and was possibly intended for debug purposes during development. The code involves standing still, pressing Up/Down/Left/Right and repeating this combination 16 more times in a row.
At any time during gameplay, if you press Down 100 times in a row, Rambo's combat knife will automatically gain 15 EXP points. This cheat does not have a limited use and can be activated as many times as needed, suggesting this was meant to be a code used for debug purposes during development and not to be used by players.
There are two hidden methods to obtain permanent unlimited ammo. In order for both of these methods to work, Rambo's combat knife needs to be at Level 1 (20 EXP points), which is difficult due to Level 2 being only 320 EXP points away, making the chances of the player collecting the necessary ammo before Rambo levels up slim. As such, these methods were likely only intended for debug purposes and not meant to be discovered by players. If you manage to collect exactly 2 throwing knives, 3 arrows, 4 exploding arrows, 5 machine gun rounds and 6 hand grenades, all ammo and health items will be permanently refilled. The other method to get permanent refills is to have an ammo count of exactly 77 throwing knives, 77 arrows, 77 exploding arrows, and 77 machine gun rounds.
When the title screen menu cursor points to the "START" option, press B on Controller 2, then press Up/B/Right/Left/Down/Right/Left/A/B/Right/Select/B/Down/Start on Controller 1. This code unlocks a pair of debug features that can be used on Controller 2 during gameplay by pressing either A to skip the current level (up to the ending sequence), or B to switch between the Jekyll and Hyde modes.
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On the title screen, if you press the Run button at the exact moment when Momo changes from her civilian form to her powered-up form, a hidden options menu will appear that functions as both a sound test and a level select. The top half of this screen depicts Momo lounging in a bathtub, with a caption below reading "MOMO IZIRI". The latter is a play on words referencing the screen's contents, as it can be translated as either "tinkering with Momo" (i.e. playing around with in-game settings) or "groping Momo."
In World 8, it's possible to bypass almost the entire battleship level by dropping into the water and swimming beneath the ship, jumping back on once the autoscroll reaches the vessel's stern. In the international version of the original NES release, one tile is removed from the rightmost portion of the ship in order to make the final jump easier.
At the end of the game's manual is a page demonstrating how to save your progress with an 8-digit passcode, with the pilot in the manual showing his own passcode: #1BC3904. Trying to use this passcode in the game will deliver the following message:
"USAF REGULATIONS DO NOT PERMIT SAVE CODES TAKEN FROM GAME MANUALS."
However, if you enter this code backwards as 4093CB1#, Invincibility will be enabled and every mission in Theater mode will be available to select.
When run on a Nintendo DSi or Nintendo 3DS, Action Replay DSi's icon and title will be listed as Game & Watch Collection. This is a way of working around the DSi's bootleg game protection, which is done by having a built-in whitelist of every official DS game, which Action Replay circumvents by tricking the device into thinking Game & Watch Collection is being played. Action Replay DSi contains almost every byte of data from Game & Watch Collection, but jumbled into an unplayable format.
Capcom offered a demo CD based upon a beta build of the game as a pre-release promo. The entire build was on the disk, with a "time trial" style of gameplay lasting 45 minutes before exiting the game. A code was eventually worked out, utilizing a GameShark cheat device in order to disable the time trial demo's timer, enabling complete access to this earlier version. A list of notable differences compared to the retail release have been noted as a result, and Capcom would never release a time trial demo disc again.
The series' in-universe Precursor language appears in several instances throughout the game, most notably in a series of Story cutscenes. During news broadcasts covering the racing tournament, a news ticker scrolling across the bottom of the screen produces a developer message from Naughty Dog when translated. The message says hello to the player and alludes to save data-based unlockable contents. However, an as-of-yet undiscovered secret is explicitly shared; the message does offer an input code, but to date, no use or purpose for it has been found.
Version 0.09 updated the Witch effect so that a unique sound plays when moving around while riding the broom, rather than simply reusing the regular footstep sounds. This is accomplished by giving every map two copies of the same tileset: one for regular mobility and one for the broom, with the game swapping between the two as needed. While this is retained in Version 0.10, the code is simplified in the later build so that a copy of the full string is not needed on every map.
However, three areas of the game were not properly accounted for during the conversion process: the second room in Neon Tile Path, the room full of beds in Number World, and the Pink Sea all play the regular footstep sound regardless of whether or not Madotsuki has the Witch effect equipped and active. Additionally, these areas still contain leftover event data from Version 0.09's method of swapping between the two tilesets. Because the indexes for the game's tiles were altered concurrently with the streamlining of the broom code, triggering these leftover events with cheats instead swaps out the maps' graphics with ones from other areas:
• The pyramids in the second room of Neon Tile Path are replaced with Henkei Shita heads from Footprint Path A, and sitting down changes the entire tileset to that of Snow World, with the background additionally changing from solid black to solid white. It reverts back to the mostly complete Neon Tile Path tileset when Madotsuki sits back up. • The tileset for the room full of beds in Number World is replaced with that of Forest World, temporarily reverting back to the proper visuals whenever Madotsuki sits down. The background, however, is unaffected. • The Pink Sea is completely blacked out, as the game attempts to call blank divider tiles when in this state.
In 2024, a hidden variation of the Konami Code was discovered in the game that allows you to unlock all characters and costumes from the start. To activate it, on the title screen, press C-Up four times/C-Down four times/C-Left/C-Left/C-Right/C-Right/C-Left/C-Left/C-Right/C-Right/L/R/Z.
In the Bizarre Room in Wonderland, the fireplace's flames can be "put out" if Sora attacks the fireplace's grated opening with a Blizzard spell, and it can be lit anew if the grated opening is hit with Fire magic instead. Being able to put out the fire makes the second phase of the Trickmaster Heartless boss fight even easier, as the frantic boss cannot light their juggling apparatuses and fling their own Fire at Sora. This is also possibly why the Cheshire Cat gifts Sora a Blizzard spell/upgrade when Sora obtains and shows him at least the Claw Marks piece of evidence during Alice's trail, and also why the grated opening itself is able to be locked onto.
The original release of the ROM hack was criticized by many players for having an unexpectedly high difficulty spike in the latter portions of the game. Among these critics were Vinny of the livestreaming group Vinesauce, who conducted a livestream of the hack thanks to it being a fangame designed around his content. In response to this, the hack's developer, Eminus, released an "easy mode" version on the r/vinesauce subreddit which reduces slowdown, adds additional power-ups, and allows the player to toggle indefinite invincibility on and off using the R button.
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:
If the player enters Threed's circus tent and repeatedly uses the Check command on the rightmost corner, the game will glitch in a variety of unpredictable ways. The most minor of these outcomes involves a short delay in when the "No problem here." text box is thrown up, while more major results can escalate into full-scale corruptions; most results involve the text box spewing garbage data. The reason for these phenomena is because of a programming oversight: the game stores every map in a single file that players are transported around via warps. However, the corner where the glitch occurs contains a gap in the room's boundaries, enabling the player to use the Check command on out-of-bounds areas that the game was not programmed to read.
Following the shutdown of Nintendo Network on April 8, 2024, two players by the user handles of Marioiscool246 and Fishguy6564 attempted to stay connected to the service in some form by activating online multiplayer in Mario Kart 7 and playing for as long as possible. The campaign, which originated as a way to determine how Nintendo Network functionality is disabled for a given title, used bots and a custom patch to keep the pair's 3DS systems connected and active.
There are two unused pieces of headgear in the files of the original Nintendogs games: a chonmage wig (a Japanese male ponytail haircut worn by samurais in the Edo period to hold their helmets in place), and an afro wig. The chonmage has an unused description found in the Japanese version of the games and had all of its assets in the international releases replaced with the data for the Rainbow Wig. The afro on the other hand was finished enough that you can use cheat codes to make a dog wear it, but it does not have any leftover text or item attributes that let it be obtained as an item. It may have been cut from the games late into development due to concerns over racial offense and replaced with the Rainbow Wig, which has a very similar appearance to the afro, but with a rainbow-colored texture instead of one resembling black hair.
In World 8, it's possible to bypass almost the entire battleship level by dropping into the water and swimming beneath the ship, jumping back on once the autoscroll reaches the vessel's stern. In the international version of the original NES release, one tile is removed from the rightmost portion of the ship in order to make the final jump easier.
At the end of the game's manual is a page demonstrating how to save your progress with an 8-digit passcode, with the pilot in the manual showing his own passcode: #1BC3904. Trying to use this passcode in the game will deliver the following message:
Version 0.09 updated the Witch effect so that a unique sound plays when moving around while riding the broom, rather than simply reusing the regular footstep sounds. This is accomplished by giving every map two copies of the same tileset: one for regular mobility and one for the broom, with the game swapping between the two as needed. While this is retained in Version 0.10, the code is simplified in the later build so that a copy of the full string is not needed on every map.
Although the Spiky-eared Pichu obtainable in the Ilex Forest event has a shiny form, this form cannot be obtained in the game itself without hacking.
