Easter Eggs are different references to other franchises, secrets and additional game modes that the player can unlock only under specific circumstances.

All easter eggs can be activated only after beating the demo at least once and typing "debug" on the keyboard while at school.

Easter Eggs Modes[]

For the full list of easter eggs modes, see this page.

Pressing the / or ? key (not to be confused with \ key for debug menu, switched with the ù key in some keyboards) will bring up the "Easter Egg Menu", which will show a list of avaliable easter eggs modes. The player can only deactivate an easter egg mode by reloading the school day.

When an easter egg mode is activated:

• Student Council members and Raibaru Fumetsu won't be able to apprehend the protagonist anymore;
• All students use coward idle animation;
• Senpai ignores the protagonist's actions;
• The Journalist disappears.

Minor modes[]

The following modes are not mentioned in the easter eggs list in game or the wiki but can be activated:

• No gravity for corpses. The corpses and limbs will fly freely in the air. Activated by pressing I in the easter eggs menu.
• Camera heads. Turns all characters' heads into security cameras. Activated by pressing 3 in the easter eggs menu.
• Green screen. Spawns a green screen near the Confession Tree. Activated by pressing F in the debug menu (\). Pressing Z will cycle through colors.

Cheat Code Easter Eggs[]

Blood Maid Mode[]

The player must type 'bloodmaid' in-game to activate Blood Maid Mode. This mode was put into the game as a birthday present to one of YandereDev's friends. It doesn't seem to reference any specific media.

Blood Scythe[]

The Blood Scythe is a weapon only available once Blood Maid Mode has been activated. It will appear in the Drama Club when activated.

CBoy[]

Main article: CBoy

The player must type 'cboy' in 202X Buraza Town to activate it. This easter egg adds two new passerbyers to the street and slightly changes the appearance of already existing one. This easter egg is a reference to the YouTuber, CBoyDoesStuff.

Fun Girl's chase[]

Main article: Fun Girl

To activate Fun Girl's chase sequence, the player must type 'fun' ten times. This will make All NPCsdisappear and Fun Girl will spawn randomly in the school. The atmosphere will turn grey and Fun Girl will chase the player. When she catches up with the player, the game will crash.

LiL. Meow Mode[]

The player must type 'lilmeow' at the title screen to activate LiL. Meow Mode. The protagonist will use the model and the name of a popular Arabian VTuber lil Meow.

Medibang Mode[]

The player must type 'medibang' in-game to activate it. This mode was put into the game as a prize to the winner of the medibang contest. It is the winner's OC. It doesn't seem to reference any specific media.

Originally, player was supposed to type it in title screen, and one of the students was supposed to change into the OC. During the time of the contest happening, typing 'MEDIBANG' in-game would change Kokuma Jutsu into Ayano's Cousin.

Miyuki Mode[]

Main article: Magical Girl Pretty Miyuki

To activate Miyuki Mode, first, the player has to pick up the Magical Girl Wand in the Drama Club. Then, they must type 'loveandjustice'. When the player types the "c" key, it will make Ayano crouch. Stand up, pick up the wand again, then type "e". Ayano will transform into Miyuki. During this easter egg, she can attack students with a "love beam" by pressing Left CTRL when she is holding the Magical Girl Wand, or just kill students with the wand like a weapon by pressing F to attack as per normal. Love hearts will come out when killing with the wand. Ayano can also punch by pressing Left CTRL while not holding the wand.

Nostalgia Mode[]

The player must type 'nostalgia' in-game to activate Nostalgia Mode. This mode changes Kaga Kusha's hair to his concept art. This easter egg was added in September 1st, 2024 build.

osu Mode[]

The player must type 'osu' three times in-game to activate Osu Mode. This mode changes Ryuto Ippongo's hair into his original one. This easter egg was added in June 15th, 2024 build.

PikaLoli Mode[]

Main article: PikaLoli Mode

The player must press the Space Bar 20 times or type 'pikaloli' at the title screen to activate PikaLoli Mode. The protagonist will use the model and the name of a popular Saudi Arabian VTuber PikaLoli.

Anodixo[]

The player must type 'anodixo' at the title screen to activate Anodixo Mode. The protagonist will use the model and the name of a VTuber Anodixo. This easter egg was added in February 15th, 2025 build.

Pumpkin Head[]

The player must type 'spooky' in-game to activate Pumkin Heads. After this easter egg is activated, all students at the school will be given "Pumpkin Heads".

Rainey[]

If the player types out the word 'rainey' on their keyboard, a female student will appear in the Martial Arts Club just behind where Budo Masuta stands. She will wear the default uniform regardless of customization and has a long brown braid. She will slowly sway side to side.

Ship Girl Mode[]

Main article: Ship Girl Mode

The player must type "shipgirl" in-game to activate Ship Girl Mode. This mode is a reference to the video game Azur Lane. This mode cannot be deactivated until the game is reset or the day changes. Ayano's uniform will change to a swimsuit and she will be flying. She will wear the next hairstyle and eye-wear from the one she was previously wearing, due to pressing "H" and "P" when typing the mode, although this can be changed back. The floor around the campus will be covered in water, with its level varying based on Ayano's current position, and she will leave a trail in the water every time she moves. She will also acquire a gun mount that can be used to shoot fireballs, killing students and teachers in their path.

Sponsor debug commands[]

Main articles: PPStarrs, Lacuna, ChessterTrap, Title Belt

There are 4 sponsor debug commands in Yandere Simulator. PP starrs, LacunaEclipsed, ChessterTrap, and WWEJayGaming are currently the only sponsors to have these debug commands. After activating Debug commands, the player must type "ppstarrs", "lacuna", "chesstertrap", or "WWEJAY" in order to activate these. The first two, PP starrs and LacunaEclipsed, will have their characters go over Ayano's character model. However, ChessterTrap's character will go over Senpai's model. WWEJayGaming's debug command will instead spawn a Title Belt that can be found in the middle of the south wing rooftop.

THATDUDE[]

The player must type "thatdude" (the nickname of Jay from the Kubz Scouts, as mentioned above) to activate this Easter Egg. Nasu Kankoshi's model will change to have a shorter skirt and a larger bust and posterior. This Easter egg was added in the April 27th, 2019 Build due to Jay expressing his disdain over the Muja Kina placeholder model (which similarly had large buttocks) being replaced with Nasu's model.

Demonic Ritual[]

Main article: Demonic Ritual

If the debug commands are activated, the protagonist can use Ritual Knife to kill anyone with it. Putting the knife back in it's place will transport the protagonist to a dark void, where five demons stand in a circle. The player can converse with each of them and do their rituals.

Easter Egg Students[]

Ryuto Ippongo, Pippi Osu, Midori Gurin, Mai Waifu, Kuu Dere, Himeko Dereguchi, Fureddo Jonzu, Rojasu Norubiru, Sukubi Dubidu, Dafuni Bureiku, and Beruma Dinkuri are all references to various characters in media.

Ryuto is based on Ryuta Ippongi from Osu! Tatakae! Ouendan, Pippi is from a fangame of Ouendan called Osu!, Midori is based on Churuya from Haruhi Suzumiya' and fans who email YandereDev constantly, and Mai Waifu is based on YandereDev's dream anime girl and himself as an anime girl.

The Photography Club members are a reference to the ‘Mystery Gang’ from the Scooby-Doo franchise. Fureddo is a reference to Fred, Rojasu is Shaggy, Sukubi is Scooby-Doo, Dafuni is Daphne, and Beruma is Velma.

Kuu Dere is based on Rei Ayanami from Neon Genesis Evangelion.^[1]

Himeko Dereguchi is based on Himedere-chan from Kuudere Simulator 2.

Storage Room Easter Eggs[]

The following Easter Eggs can be found inside the northeastern storage room on the first floor.

Bunny Ears[]

On a table at the right side of the room, lays white long bunny ears. This is a reference to Simply April. When picked up, Ayano will wear it until the day ends or is restarted.

Pink Mustache[]

On a table at right side of the room, there is a fake pink mustache. This is a reference to Markiplier. When picked up, Ayano will wear it until the day ends or is restarted.

Carrot[]

On a table at the right side of the room, there is a carrot, a reference to Veggie Gamer`s channel logo. When picked up, Ayano will hold it in her mouth until the day ends or is restarted.

THAT DUDE Sunglasses[]

On a table at the right side of the room, there is a pair of sunglasses with the word "THAT" on the right lens and "DUDE" on the left lens. This is a reference to Jay from the Kubz Scouts. When picked up, Ayano will wear it until the day ends or is restarted.

Unicorn Horn[]

On a table at the right side of the room, there is a unicorn horn. This is a reference to is a reference to iHasCupquake. When picked up, Ayano will wear it until the day ends or is restarted.

Cheese[]

There is a piece of cheese near a mouse hole at the bottom of the room. When examining the piece of cheese, words will come up on the HUD, saying, "Knowing the mouse might one day leave its hole and get the cheese... It fills you with determination." This is a direct reference to a line from Undertale.

Saikou Company Cardboard Box[]

There is a cardboard box inside the room that Ayano can "hide" in. This is a reference to the cardboard box stealth mechanic in the Metal Gear series. The player can remove it by pressing the Left CTRL key.

Cheongsam[]

There is a miniature Cheongsam/Qipao on a table on the left side of the room, next to the Golden C. It is a body-hugging traditional Chinese dress (usually red), very popular in China and the Asian countries. It is of Manchu origin. Also called Mandarin Gown during the 1920s-1930s in Western Countries. It was used as the attire of Corona-chan.

Crush[]

There is a golden C on a table on the left side of the room, which is a reference to Crush Crush. When interacted with, Ayano's model will change to that of several of the girls from Crush Crush.

NGB Bear[]

NGB Bear can be activated with the A key. This is a reference to Keylina NbG. When activated, it will follow Ayano around until the end of the day, or when A key is pressed again.

NyanDroid[]

NyanDroid can be activated with the A key. This is a reference to TheNyanCave. When activated, it will follow Ayano around until the end of the day, or when A key is pressed again.

Miscellaneous[]

Ancient Evil[]

Main article: Ancient Evil

If Ayano goes behind the tree on the left when entering the school, the player will have the option to summon the Ancient Evil, called "Void Goddess", which can be used to activate or deactivate (or toggle) students and teachers, or to teleport people to Ayano's current location.

Bad Romance Mode[]

Main article: Bad Romance Mode

The Player must collect all eight stationery objects and then press the Left CTRL key while standing on the rooftop to activate Bad Romance Mode. This mode is a reference to JoJo’s Bizarre Adventure, with Bad Romance as Ayano's Stand. If the Left CTRL key is pressed, Bad Romance will throw a rapid flurry of attacks, emulating the fighting style most commonly utilized by Stands in JoJo's Bizarre Adventure.^[2] The stationery objects are located in each Classroom, in the Faculty Room and in the Headmaster's Office.

Confession Tree Voice[]

If Ayano steals Sakyu Basu's ring and then goes to the Confession Tree behind the school, a female voice will say "...that...ring...". The voice belongs to Sakyu and Inkyu's mother. Afterwards, the tree's upper branches will start wiggling.[1]

Fun Girl in the title screen[]

Main article: Fun Girl

Fun Girl can rarely appear in the title screen for few seconds. She appears more often after beating the Alternate Timeline.

Glowing Blue Eye[]

The left eye of the skull in the Occult Club will glow blue after examining the cheese in the northeastern storage room. This is another reference to Undertale, mainly the character Sans, whose left eye also glows blue.

Mysterious Keys[]

The mysterious keys are the key to unlocking an easter egg, the destroying robot, also known as the Heartbreaker,^[3] found in the Science Club. There are 5 keys, which are located in different places in the school, these will only appear if the debug commands are activated and exclusively in 202X mode.

Locations[]

• Cooking Club, northwest side of the room
• Occult Club, northeast side of the club
• Art Club, northeast side of the club
• Martial Arts Club, northeast side of the club
• Photography Club, northwest side of the club

Tatoko (female turtle)[]

If Ayano goes to Tatoro in the Light Music Club and asks him to forgive their sins 10 times, Tatoko (a pink turtle wearing a bow) will appear alongside Tatoro in his tank. She serves for cosmetic purposes only.

Senpai's Book Text[]

At various times each day, Kuu Dere, and Taro Yamada will walk to their respective places and read a book. Students in 1980s Mode and during 202X Mode's second week also read this book. This book contains simple information on Yandere Simulator's premise.

The last paragraph is a reference to the Undertale game file, "abc_123_a.ogg", in which listeners are asked not to spoil the game for others.

Yanvania Easter Egg[]

There is an Easter Egg in Yanvania: Senpai of the Night. If the player presses M during the afterlogue, Midori Gurin will pop out from the right side of the screen and the afterlogue will start in her voice. The disk error will occur after she is finished.

Easter Eggs in game files[]

Fun.txt[]

Main article: Fun Girl

The Fun.txt was added into the Streaming Assets folder as of the February 8th, 2016 Build. Within the text was a single zero, which the player could change. Depending on the number entered, there would be several texts before the game usually crashes. Deleting this file does not have any effect on the game and it will run as normal. The file was removed in the January 4th, 2017 build, and readded in the April 2nd, 2018 Build.

There's also a lot of similarity between Gaster and Fun Girl since both were erased and split between time and space because of a "Failed Experiment". Fun Girl also could be mentioning the Genocide Route in Undertale because the quote "But Nobody Came".

As of the April 7th, 2023 build, Fun Girl can be reactivated by changing the game's Fun Value in the game files.

KON Mode[]

KON mode is an Easter Egg which the player cannot activate without modifying the game. It is unknown why YandereDev has not added the option to activate this Easter Egg. It has been around since the March 3rd, 2015 Build. This is a reference to the anime K-On!.^[4]

Website Easter Eggs[]

Konami Code[]

If the Konami code is entered on the characters page, the website's theme will become dark. All the current characters' profiles will be replaced by a profile of the Fun Girl. Her role, status, personality, appearance, and weakness will all be "?????". If the player hovers over her image, the page will start to turn to static and eventually the screen will go black. The Japanese text on the left says:

Which translates to:

If the player entered it again, the screen will fade out quickly, turning black. The screen will turn red after a short pause, and multiple Fun Girls will start to flash on-screen. If entered again, the red background will turn black. The black background will last about 10 seconds before it turns red again. On subsequent code entries, the background will turn black, but only if the background is red. If it is black, it will not change to red when the code is entered.

Trivia[]

• If it becomes possible to choose Ayano's gender, then male-equivalent Easter Eggs will have to be created.^[5]
• There may be an Easter Egg where one NPC is secretly a magical girl, and there would be an opportunity to see her transform. It's a low priority, however.^[6]
  • In addition, if Ayano manages to collect all ten Magical Girl Pretty Miyuki manga, she will unlock a magical girl Easter Egg.^[7]
    • In the 31st October, 2018 build, this Easter Egg was implemented as Miyuki Mode, albeit with different requirements to activate it.
• C was used to disable copyrighted music until the addition of Cirno Mode. It has been shifted to D. M also mutes all of the game music.
• YandereDev's favorite Easter Egg to create is Punished Mode.^[8]
• There may be a Sonic Easter Egg where Ayano is naked, covered in blue body paint, and moves at 10x speed.^[9]
• NPCs without an AI are not affected by any mode.
• It was very important to YandereDev that some sort of cheat code or Easter Egg be added that unlocked a "giant sci-fi energy scythe".^[10] This would eventually manifest as Cyborg Mode.
• Undertale has been referenced the most through Easter Eggs, with its references being the mouse hole and cheese, the skull with its glowing eye in the Occult Club, Bad Time Mode, the Fun Girl, and the book students read.
• If an Easter Egg from the Easter Egg Menu is active, the Police will not arrive at school when the timer runs out and won't begin an investigation. They witness evidence of the supernatural which is apparently Ayano, become absolutely horrified, and run for their lives.
• The Meme Closet is locked until the demo is completed.
• The music playing when Ghoul Mode and Lilium Mode are activated is Hitman by Kevin MacLeod.

References[]