Easter Eggs

Easter Eggs are fun surprises in Yandere Simulator that the player must discover in order to use.

YandereDev has included many Easter Eggs in the debug builds of the game. They include wearable accessories for Ayano Aishi, game modes, a small timed event at the starting menu, references to several anime characters or in-game jokes, and a phantom. The final game may have cheat codes that change the appearance of the characters, like the Easter Eggs do.

Modes
Pressing the ? key will bring up the "Easter Egg Menu". The menu shows the following options:

47 Mode

 * Main Article: 47 Mode


 * L key to activate 47 Mode. This mode will make Ayano bald, have a barcode on the back of her head, and change her shirt to a black jacket with a red bow. This mode is a reference to the Hitman series.

AI Mode

 * Main Article: AI Mode


 * Space key to activate AI Mode. This mode is a reference to Kizuna AI, a Japanese virtual YouTuber. Ayano's model will be replaced with Kizuna AI's model. If the Space key is pressed again, Kizuna will change her facial expression. It is not listed in the Easter Egg menu and it got removed due to copyright.

Bad Romance Mode

 * Main Article: Bad Romance Mode


 * Collect all eight stationary 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, as Bad Romance is 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.

Bad Time Mode

 * Main Article: Bad Time Mode


 * U key to activate Bad Time Mode. This is a reference to the popular game Undertale. Ayano will resemble the character Sans from the said game, and will sway side to side. If the Left CTRL key is pressed, she will be able to use his attacks from the fight in the Genocide Route of the game to kill NPCs.

Bancho Mode

 * Main Article: Bancho Mode


 * B key to activate Bancho Mode. Ayano will resemble a bancho girl with white hair and red eyes. If the Left CTRL key is pressed, she will lean forward and unleash a flurry of punches.

Black Hole Mode

 * Main Article: Black Hole Mode


 * F5 key to activate Black Hole Mode. Ayano will become all black with orange eyes and long, messy black hair. She will levitate and glow with particles around her. NPCs that get too close to Ayano will be torn apart and shrink as they get sucked into her body.

Blade Hair Mode

 * Main Article: Blade Hair Mode


 * 6 key to activate Blade Hair Mode. Ayano will have bright pink twin tails with blades at the bottom. Pressing the Left CTRL key button will cause Ayano to spin rapidly. NPCs that touch her hair will be dismembered instantly.

Cirno Mode

 * Main Article: Cirno Mode


 * C key to activate Cirno Mode. This mode is a reference to Cirno, from Touhou. Ayano's outfit and hair will become blue, and she will resemble Cirno. Pressing the Left CTRL key button will make Ayano shoot ice out of her hands, killing any NPC they touch.

Cyborg Mode

 * Main Article: Cyborg Mode


 * Y key to activate Cyborg Mode.  This mode cannot be deactivated until the game is reset or the day changes. Ayano's uniform will change into a black cyborg suit with a neon blue visor. She will also acquire a long silver ponytail and an Energy Sword that can be used to dismember students and teachers. Ayano will run faster than normal. Pressing "P" will take off the helmet.

DK Mode

 * Main Article: DK Mode


 * K key to activate DK Mode. This mode will enlarge the head and arms of Ayano and every NPC with a working AI. This is a reference to a cheat of the same name and function from the video game GoldenEye 007.

Ebola Mode

 * Main Article: Ebola Mode


 * E key to activate Ebola Mode. Ayano will become deathly pale with pink pigtails that resemble the Ebola virus, a reference to Ebola-chan. Any student she touches will instantly die (presumably from Ebola), including Senpai. As of the January 3rd, 2019 build, Senpai can no longer be killed by Ebola.

Enigma Mode

 * Main Article: Enigma Mode


 * D key to activate Enigma Mode. It is a reference to Kingdom Hearts and Star Wars. Ayano will wear a long black dress with a hood, she will frown and hair will cover her left eye. When the CTRL key is pressed, she will get lightsabers. If F or R is pressed she will attack. When an NPC is attacked, there will be a health bar showing how many more attacks are needed to kill them.

Falcon Mode

 * Main Article: Falcon Mode


 * F key to activate Falcon Mode. Ayano will don a full body outfit of Captain Falcon, the main character of F-Zero. Pressing the Left CTRL key will make Ayano punch forward very fast, sending anyone on her way with a proper AI flying up into the air. She also runs very fast.

Galo Mode

 * Main Article: Galo Mode


 * G key to activate Galo Mode. It gives Ayano tanned skin, gold bracelets, sunglasses, and Super Saiyan hair. Pressing the Left CTRL key will make Ayano "power up", but her reputation will be affected if she's seen by students.

Gazer Mode

 * Main Article: Gazer Mode


 * 1 key to activate Gazer Mode. It is a reference to Gazer. Ayano will have light gray skin and black goo down her body. Press the E key to kill NPCs in several different ways, depending on the floating eyes' color.

Hateful Mode

 * Main Article: Hateful Mode


 * H key to activate Hateful Mode. It is a reference to Hatred, and its main character, "The Antagonist". Ayano's uniform and skin will become monochrome, as well as the screen. Sanity levels will be set to the minimum.

Horror Prototype Mode

 * F2 key to activate Horror Prototype Mode. This mode will make the school become dark, the camera will zoom in a bit, Ayano will hold a flashlight, all students will disappear, and Nemesis will be walking around the school hunting for Ayano.

Hunger Mode

 * Main Article: Hunger Mode


 * 6 key to active Hunger Mode. It is a reference to the video game Little Nightmares. Ayano will wear a yellow raincoat with a triangular hood. She can eat people and gain speed.

Huntress Mode

 * Main Article: Huntress Mode


 * Q key to activate Huntress Mode. It is a reference to Samus from the Metroid series. Ayano will wear a blue body suit, have blonde hair and green eyes, and will have a mole under her lower lip.

Life Note Mode

 * F3 key to activate Life Note Mode. It is a reference to the Life Note anime in the game. Ayano will bear the appearance of Yamiko, the protagonist of said anime, and can write specific ways and times for any student to die in her notebook. It is a reference to the popular anime, "Death Note".

Lilium Mode

 * F6 key to activate Lilium Mode. Ayano will become naked, wearing a metal helmet and acquiring transparent, ghostly arms that protrude from her back. She will also have white cloth bandages wrapped around her bare body. Her arms function like the Pain Demon's ritual, dismembering any student that gets close to her. The name "Lilium" is a reference to the hymnal-like opening theme for the Elfen Lied anime, while the mode itself is based on the main character, Lucy.

Man Mode

 * F4 key to activate Man Mode. It is a debug for the previous "Mandere Simulator" April 1st (April Fools) build. When the April 2nd build came out, reverting back Yandere Simulator, YandereDev stated in a blog post that Mandere Simulator would still be accessible through the easter egg menu.

Medusa Mode

 * Main Article: Medusa Mode


 * M key to activate Medusa Mode. It is a reference to Medusa from Greek Mythology. Ayano will resemble Medusa and have hair made of green snakes, her uniform will have a green color scheme. If a student looks at Ayano, they will turn to stone. If she laughs, everybody that notices her will turn to stone.

Miyuki Mode
Main Article: Magical Girl Pretty Miyuki
 * To activate Miyuki Mode, first, you have to pick up the Magical Girl Wand in the Drama Club. Then, type "love and justice". When the player types the "c" key, it will make you 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. Love hearts will come out when killing with the wand.

Punch Mode

 * Main Article: Punch Mode


 * O key to activate Punch Mode. Ayano will become bald and don the full body outfit of Saitama from One-Punch Man. When the Left CTRL key is pressed, she will use his iconic punch. Any student hit that has a complete AI will go flying.

Punished Mode

 * Main Article: Punished Mode


 * P key to activate Punished Mode. This mode is a reference to the video game Metal Gear Solid V: The Phantom Pain. It gives Ayano a torn-up version of the original Akademi High School outfit, a tan-colored scarf, a black eyepatch on her right eye, a red left arm, a scar on her left eye, a black protrusion from her forehead, a black glove on her right hand, and a cigar.

Ship Girl Mode

 * Main Article: Ship Girl Mode


 * Type "ship girl" in-game to activate Ship Girl Mode.  This mode may be a reference to the game Kantai Collection. 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. The floor in the whole campus will be covered with water and Ayano will then be leaving 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 the path.

Slender Mode

 * Main Article: Slender Mode


 * Z key to activate Slender Mode. This mode makes Ayano's uniform turn a very dark gray, her skin completely white, her eyes blank, and her body shape resembling that of the Slender Man. Activating this mode sets Ayano to minimum sanity level. This mode was created because it was very easy to stretch out Ayano's limbs.

Spooky Mode

 * Main Article: Spooky Mode


 * S key to activate Spooky Mode. This mode turns all female students and teachers into skeletons.

Titan Mode

 * Main Article: Titan Mode


 * T key to activate Titan Mode. This mode is a reference to Attack on Titan. It will remove the students' clothing and skin and make them increase greatly in size. It will also change the blue parts of Ayano's uniform to brown. This mode's name may be changed to Colossus Mode at some point.

Tornado Mode

 * Main Article: Tornado Mode


 * 7 key to activate Tornado Mode. This mode is a reference to the One-Punch Man character Tatsumaki. Ayano will have messy pink hair and a long white dress. Pressing the Left CTRL key will summon tornadoes that will kill NPCs.

Witch Mode

 * Main Article: Witch Mode 


 * W key to activate Witch Mode. This mode is a reference to Bayonetta (Cereza), the main protagonist of the Bayonetta series. It does not show up on the Easter Egg menu. Ayano will have her default black ponytail, red lipstick and she will wear a black body suit.

X Mode

 * Main Article: X Mode


 * X key to activate X Mode. This mode turns Ayano into /x/-tan, a personified mascot of 4chan's /x/ Board. She has rainbow stockings, black hair, an eyepatch on her left eye, black underwear, and a black tank top with a skull on it. Pressing the Left CTRL key will cause Ayano's hair to change to the Hateful Mode hairstyle and will remove the eyepatch, revealing a glowing red eye.

Yandere-kun

 * Main Article: Yandere-kun


 * 8 key to activate Yandere-kun. This mode turns Ayano into Yandere-kun. This mode can be combined with other Easter Eggs, however, Yandere-kun will wear his uniform beneath the Easter Egg outfit.

Yanketsu Mode

 * Main Article: Yanketsu Mode


 * 4 key to activate Yanketsu Mode.  This mode is a reference to Kill la Kill. This mode cannot be deactivated until the game is reset or the day changes. Ayano's uniform will change into a revealing white, blue, and pink outfit. She will also acquire a Knife Blade that can be used to dismember students and teachers.

Long Skirt Mode

 * V key to activate Long Skirt Mode. This will make Ayano wear a long, blue skirt that reaches her ankles. There is no real name for this mode yet. It does not show up on the Easter Egg menu. YandereDev has made the mode because it "allows him to test out a 'dress' character model so that he can look for bugs."

Naked Mode

 * N key to remove clothes. This will make Ayano nude. It does not show up on the Easter Egg menu.

Gravity on Corpses Disabled

 * I key to disable the gravity on corpses. This will make all corpses and dismembered limbs fly away. This only works on students or faculty members killed after the easter egg has been enabled.

Security Camera Heads

 * If the players presses 3, female students' and faculty's heads will be replaced with large security cameras.

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!.

Phantom Girl

 * Main Article: Phantom Girl

If Ayano takes a picture in the bathroom on the third floor, a semi-transparent girl about the size of an average student model will appear in the picture. No matter where Ayano is, the ghost will be looking in her direction.

Demonic Ritual

 * Main Article: Demonic Ritual

As of the February 21st, 2016 Build, a ritual knife has been added to the altar in the Occult Club room. Killing a student with it and then putting it back in the altar will transport Ayano to a dark void, where five figures stand in a circle. The player can converse with each of them.

Starting Screen
After about ten seconds, the title screen will show the darker side of the game for a short amount of time, including a dark atmosphere, a bloody uniform, and squirming corpses. Pressing the Space Bar can manually change to the "insane" title screen, but only for a short amount of time. Tapping the space bar repeatedly will make it last longer.

The player can also press F1, F2, F3, F4, or F5 to change the students' uniform on the main menu screen.

In an older version, the starting screen had different animations every ten seconds, such as Ayano stabbing a student rapidly, being covered in blood while carrying a severed head, and staring blankly at the viewer. The only sound played during these scenes was static.

Opening Screen
As of the November 1st, 2015 build, pressing the Y key on the opening screen will start Yanvania: Senpai of the Night as if the player had gone to Ayano's room at night to play it. When she finishes the game, it will end with the afterlogue and the disk error as normal, and the player will be in Ayano's room in the morning in pajamas instead of her uniform.

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

Gaming Club
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.

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

Other
Kuu Dere is based on Rei Ayanami from Neon Genesis Evangelion.

Video Game Easter Eggs
There is an Easter Egg in Yanvania: Senpai of the Night. If the player presses M on the title screen, 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.

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

Bunny Ears
On a shelf 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.

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.

Carrot
On a shelf 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.

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.

Crush
There is a golden C on one of the shelves, which is a reference to Crush Crush. When interacted with, Ayano's model will resemble 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.

Pink Mustache
On a shelf at the 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.

Poem
On a shelf to the left side of the room, there is a poem by Laina Morris. This is a reference to the game "Doki Doki Literature Club!". When interacted with, Ayano will resemble the girls from "Doki Doki Literature Club!".

Scrub-chan
On a shelf at the right side of the room, there is a lime green puppet with a leaf sprout who resembles Scrub-chan, Bijuu Mike's mascot. When picked up, it will be placed on Ayano's left shoulder until the day ends or is restarted.

THAT DUDE Sunglasses
On a shelf 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.

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

Book
At various times each day, Kuu Dere, Senpai, and Horuda Puresu will walk to their respective places and read a book. Study-kun B used to read the same book in the library. 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.



Confession Tree Voice
If Ayano steals Sakyu Basu's ring at lunchtime and then goes to the Confession Tree behind the school, a female voice will say "...that...ring...".

Delinquents
Between the April 15th, 2017 and April 26, 2018 builds, if the player pressed the Space Bar ten times in front of the placeholder delinquents, they donned Team Skull masks and danced slowly.

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.

Glowing Blue Eye
The left eye of the skull in the Occult Club will glow blue after viewing the cheese. This is another reference to Undertale, namely the character Sans, whose left eye also glows blue.

Pink Turtle
If Ayano goes to Mr. Jazzy Feet in the Light Music Club and asks him to forgive their sins several times, a pink turtle wearing a bow will appear alongside Mr. Jazzy Feet in his tank.

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.

Front Page

 * If the Konami code (up, up, down, down, left, right, left, right, B, A) is entered on the main page, the website will become red and black instead of light pink. (this one won't work anymore because the page has changed)

Characters Page
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 you 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.

Bugs

 * In DK Mode, it is difficult to mop up blood because the mop grows and moves through the floor when the player picks it up.
 * Long Skirt Mode will not work correctly for any uniforms besides the default one, as it glitches the textures.
 * If the player kills all the teachers and students in the school with an Easter Egg mode, at the end of the day, the game will still say that a teacher discovered a corpse.
 * When activating Naked Mode, Ayano will still be wearing her panties. To fix this, change into a different uniform in the locker room.

Trivia

 * If it becomes possible to choose Ayano's gender, then male-equivalent Easter Eggs will have to be created.
 * 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.
 * In addition, if Ayano manages to collect all ten Magical Girl Pretty Miyuki manga, she will unlock a magical girl Easter Egg.
 * 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. With Cirno Mode now available, it has been shifted to D. M also mutes all of the game music.
 * YandereDev's favorite Easter Egg to create is Punished Mode.
 * There may be a Sonic Easter Egg where Ayano is naked, covered in blue body paint, and moves at 10x speed.
 * 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 in the future will unlock a "giant sci-fi energy scythe". It was later revealed to be the Cyborg Mode.
 * In the game's code, Info-chan's glasses are named KON glasses.
 * 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.