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On the Credits of the PC version, switch from the Scrolling Credits over to the Photo credits featuring headshots of the developers who worked on the game. From this point, quickly click on the photos as they appear on-screen. After an unknown amount of clicking, a secret minigame will begin where you must click the photos before they disappear to score points.

Pandaman from the One Piece series makes a cameo appearance as a hidden playable character in the game. According to One Piece creator Eiichiro Oda, Pandaman was originally created as an entry for a character-design contest for the Kinnikuman series, who later used him as a gag character within the One Piece anime and mangas.

Boss levels in Mega Man X6 are tied to the number of Nightmare Souls the player has obtained, up to a max of Level 4 at 5,000 Nightmare Souls. If Nightmare Zero is beaten at Level 4, Zero's black armor from previous games is unlocked. This armor is only normally unlockable with a cheat code entered at the title screen (L/L/L/ZR). Due to an oversight, the final stage unlocks automatically when the player obtains only 3,000 Nightmare Souls, meaning that Nightmare Zero is impossible to fight at Level 4 without a GameShark code (300CCF5F 0003 for the US version of the game) since he becomes unavailable when the final stage is unlocked.

In The Promised Lands expansion pack for the PC Engine CD, it's possible to encounter randomly-generated levels themed after the Bomberman series. One such level can be accessed with the code "LOWUSDON", and features several White and Red Bombermen inhabiting fortresses in their likeness and setting bombs across the world map.

In 2022, a pair of previously unknown cheat codes for the SNES version were discovered, presumably having been used for debug purposes:

•From the title screen, by holding the R and Y buttons on a second controller, and then pressing Start or A on the first controller, a new menu will appear showing Little Mac versus head profiles of all 16 fighters in the game, allowing you to select whoever you want for a one-off match. After the match is finished, you are sent back to the same menu.

•Also on this menu, an unbalanced two player-mode can be accessed if the second player holds down B or Y on their selected opponent until the match starts. As the opponent, using A, B, X, or Y in tandem with Up and Down will allow you to pull off every basic and advanced attack in each boss's arsenal. This mode is unbalanced in that every boss is still more powerful than Little Mac and have pauses with "tells" for when they are about to attack, and if dodged successfully will leave them vulnerable to attacks.

Exclusive to the 3DO version, in the level "The Project", there is a secret exit towards the bottom of the map with a Question Mark caption just before it reading:


Going through the secret exit will boot up a secret Breakout clone, where you control Gex shooting balls up towards isometric cubes. To catch the ball, it must hit Gex's head, or if it is too far away from his head, Gex can shoot his tongue out a short distance to catch it just before it lands. The game's second boss, The Flatulator, also appears in this minigame, and hitting him with the ball will allow Gex to shoot the ball higher, while propellors will occasionally appear to generate more cubes.

This game appears to be another small project that was repurposed into an Easter egg, although there are no known messages or credits that appear during it. It's unknown why this minigame was left out of other versions of the game.

Exclusive to the 3DO version, in the level "The Project", there is a secret exit in the bottom-left corner of the map with a Question Mark caption just before it reading:


Entering this secret exit will boot up a 3D side-scrolling shoot-'em-up level. The game gives you 5 credits and 3 hit points to play through the game. You can pick up remote controls, and after getting enough of them your ship will now have triple shots. For every enemy shot at, the score will change to different quips and numbers at random, including:

•"69 Dude!"
•666 (the Number of the beast)
•90210 (the zip code to Beverly Hills, California and a reference to the 1990 television series "Beverly Hills, 90210")
•"Googleplex" [sic] (Googolplex, the company Google did not exist at the time this demo was made or when Gex was first released)
•"Really high!"
•"Way up there"
•"Astronomical"
•Infinity
•"Score is cool, huh, huh"
•"Are you still counting?"
•"I don't know"
•"I lost count"
•"Who cares!"
•"Who keeps score!"
•"Missed one!"
•"Watch your butt not the score!"
•"Is your controller plugged in"
•"Loser!"
•"You suck!"
•"Sucks to be you!"
•"How bad are you?!"

It was originally a senior college project for Stanford University by programmer Evan Wells, but was repurposed as an Easter egg for this game. On the Game Over screen, the game's credits can be seen:


This Easter egg was first known to have been documented in a pair of grainy YouTube videos from 2007. It's unknown why this minigame was not included in other versions of the game.

After beating the Dog Ending, a pair of hidden cheat codes can be inputted when you continue the game afterwards (if these are inputted on the international versions of the game, make sure that the controller type is set to "2"). These cheat codes went undiscovered until 2018, and their effects were previously believed to only be accessible via hacking:

•Inputting Start/L2/Square/L3 will cause a hidden mini-map to appear in the top-right corner. A series of four raw cheat codes can also be inputted to activate different versions of the map.

•Inputting Left on the D-Pad/Left on the Left Analog Stick/Left on the Right Analog Stick/L2/L1/L3 will cause the Save menu to appear, allowing you to Save anywhere in the game.

A hidden, "Unlock Everything" cheat code exists in the game that requires a "Master Code" to enable the second button input's activation. The two separate segments of the cheat code must be inputted in a collective total of exactly 24 seconds, with a 12 second pause required between each code entered.

The Bionic Commando costume found in the Wii port of the game was likely added to promote the Bionic Commando (2009) video game as it was not yet released, making this the only Dead Rising port to tease a game currently in development by Capcom.

In "The Delicious Last Course" DLC, there is a puzzle on the map for Isle IV involving a trio of contest winners towards the back of the Isle and a set of 9 gravestones towards the front of the Isle. Completing this puzzle will unlock Spoiler:a secret boss fight that takes place in a dream world held up by the skeletal remains of the Devil (seen in claymation), where you fight angel and demon variants of the Devil on both sides of the stage. However, they each switch places back-and-forth every time you turn left or right, presumably due to Cuphead's interactions with the Devil in the main game preventing him from seeing an Angel. This boss fight was originally designed as a second phase for the Devil's fight in the main game, but ultimately went unused until the release of The Delicious Last Course. A primitive version of the phase can be found in the game’s data. This boss cannot be refought after beating it. Beating it will unlock the Cursed Relic as a charm as well as the achievement "A Horrible Night to Have a Curse", a reference to the text box seen during the day-to-night transition from Castlevania II: Simon's Quest.

In June of 2022, a cosmetic nameplate to commemorate the holiday Juneteenth was released but received much backlash due to a secondary palette for the nameplate being named, "Bonobo". The bonobo is a type of great ape, and many saw it as a racist connotation in association with the holiday. The nameplate was quickly renamed "Freedom", and an apology was issued, with 343 Industries' senior community manager John Junyszek later stating that the palette name originated from an asset-editing program commonly used at the studio, although it was not used in the development of Halo Infinite.

One of the language options allows you to play the game in the Fremen language from the Dune franchise.

In 2021, several cheat codes were discovered in the Game Boy version of the game, the first two of which must be activated through the title screen.

•Ending and Credits: Up/Down/Left/Right/Select/Start.

•Sound Test: Down/Up/Down/Up/Select/B.

•Level Select: While paused in normal gameplay, press Down/Select/Up/Left/Select/Right/B. Press A or B to select a level.

•Hidden Tribute to Hiroko Kasahara: To access it, you must first access the Sound Test menu. Then, set the BGM/SE index to 02 and press A once, then set BGM/SE index to 19 and press A once more. Lastly, you must input the following lengthy code:
Up, Up, Down, Down, Left, Left, Right, Right, Select, Select, Up, Up, Down, Down, Left, Left, Right, Right, B, B, Up, Down, Left, Right, Select, Up, Down, Left, Right, B, Select, Right, Left, Down, Up, B, Right, Left, Down, Up, Select, Select, Right, Right, Left, Left, Down, Down, Up, Up, B, B, Right, Right, Left, Left, Down, Down, Up, Up, Start.

If inputted correctly, an alternate credits sequence will play out. The normal credits plays the game's ending theme and lists the name of programmer Yutaka ★Hiroko★ Sakashita among the game's developers. This alternate credits sequence instead plays the Vs. Mode music and lists the name Hiroko Kasahara at the top of the screen. Kasahara is a J-Pop singer, and the names of the game's developers in the credits are replaced with a comprehensive discography featuring the names of several albums she had released up to 1993, including the release dates for her then-upcoming 1993 albums "L'Express Fantasie" and "Nature". Considering Sakashita used Kasahara's first name on the standard credits sequence, he is most likely the one who included this Easter egg to document his love of her music at the time the game shipped. The fact that this sequence is hidden behind two cheat codes that would take almost 30 years to be discovered, with one of them being too long to easily guess, suggests that it was never meant to be seen by players.

The looter Patches, a recurring character in the Souls series, can be found as a secret boss fight Spoiler:near the large lake in Limgrave after following the connected river north to a small cave on the left.

The Prince from the Katamari series along with Boy from Noby Noby Boy appear as two unlockable characters in Wattam, having originally been created by the game's designer Keita Takahashi.

The player can unlock an piece of concept art of what is assumed to be the inspiration for Tornado Outbreak; a poorly modeled tornado with a high polygonal model of a cow.

If you defeat Maleficent in Hollow Bastion before chasing Pinocchio in Monstro, a set of alternate cutscenes will play out as you progress through the rest of Monstro. The cutscenes where Riku talks to Sora in the first chamber of Monstro, and the cutscene where he talks to Maleficent are both edited out of this sequence.

After defeating the 12 rare Zodiac Monsters (the most difficult and time consuming task to do) that appear after beating the game, a special alternate ending to the game will play where six female characters (Holly, Colt, Viola, Minta, Crysta, and Miss Sapphire) confront the player, Errick and Cleo, with Holly and Colt stating they rounded "everyone" up to celebrate the defeat of the Zodiac Monsters. Their extremely suggestive praises of the player and anticipations of celebrating "tonight" (with Viola commenting she wants to see what makes him "tick") anger Cleo who feels that she is not being given proper credit for her work, suspects something is up, and tries to save him from the encounter, but she is attacked by Viola and appears to fall unconscious before he is "captured" and taken away by the six women. What then occurs is a fade-to-black followed by the "rest" theme that plays when you let a monster rest for the week, and the sound of two owl hoots. The scene then cuts to the following morning, where Errick remarks that he is jealous of the player and Cleo returns demanding to know what the player did the prior night as Holly and Colt giggle. She angrily denies him supper for a month, with Holly commenting she will give him some of hers behind Cleo's back.

This cutscene explicitly implies that the player partook in a harem orgy, with Colt in particular implying that the player took her virginity. Monster Rancher DS was rated E for Everyone by the Entertainment Software Ratings Board (ESRB), but their rating still points out the game features "Mild Suggestive Themes". It's unknown if this warning was added to refer to this scene or if the game's publisher intentionally left out this scene when submitting content to the ESRB for review.

A clone of Space Invaders, referred to as "Marvinvaders" by the game's developers, can be accessed on the main menu by holding Button 2 and pressing Up/Right/Down/Left/Up/Down/Left/Right. A reskin of this game would appear in a later Vision Factory title, "Golden Oldies I".

Of note about the game's HUD is that "裸猫女" translates to "Naked Cat Woman".