Easter Eggs

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

In the debug builds of the game, YandereDev has included some Easter Eggs. These are usually added when YandereDev does not have enough time to write code for the game. They include wearable accessories for Yandere-chan, game modes, a small timed event at the starting menu, and a transparent figure/phantom. The final game will have cheat codes that change the appearance of the characters, like the Easter Eggs do.

Accessories

 * Press the "H" key to cycle through hairstyles.
 * Her default hair, which is a ponytail
 * Right-sided ponytail
 * Left-sided ponytail
 * Pigtails
 * Three ponytails
 * Longer pigtails (known as twintails)
 * Drill-hair (or tornado-hair)
 * Long hair
 * Very long hair
 * Rei Ayanami's hair (Neon Genesis Evangelion)
 * Yuno Gasai's hair (Mirai Nikki)
 * Korra's hair (Legend of Korra)
 * Spiky blonde hair (Galo Sengen)
 * Hatred Mode hair
 * Rival-chan's pigtails
 * Info-chan's hair
 * Pippi Osu's hair
 * Bald with Barcode (Hitman)

Modes
By using the "?" key, you will see the "Easter Egg Menu". You can press "D" to disable the copyrighted music for Punished Mode, Bancho Mode, Hateful Mode, Spooky Mode, Titan Mode, Galo Mode, 47 Mode, Bad Romance Mode, and Cirno Mode. This shows the following options:


 * "P" key to activate "Punished Mode". This mode cannot be deactivated until the game is reset or the day changes. This mode is a reference to the game Metal Gear Solid 5. It gives Yandere-chan a torn-up version of the original Akademi High 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. It also replaces the music with "Nuclear" by Mike Oldfield.
 * "Z" key to activate "Slender Mode". This mode cannot be deactivated until the game is reset or the day changes. This mode makes Yandere-chan's uniform turn black/gray, her skin will turn completely white, make her eyes blank, and her body shape will resemble that of Slender Man's. Suspenseful music plays the whole time while in this mode. Activating this mode sets Yandere-chan to minimal sanity level (though you can still fix it), and will cause other students to treat Yandere-chan just as if she were insane. Being noticed by Senpai or by a teacher will result in Game Over. The weapon she chooses becomes larger. This mode was created because it was very easy to stretch out Yandere-chan's limbs.
 * "B" key to activate "Bancho Mode". This mode cannot be deactivated until the game is reset or the day changes. This gives Yandere-chan's bandaged arms, a black school outfit, a Sargent cap, and a pick in her mouth. The music playing in this mode is "BafBaf! Sonna ni Moeru no ga...Suki Kai" by Iwasaki Taku. This mode is a reference to Mako's Two-Star Goku Uniform from the anime Kill la Kill.
 * "H" key to activate "Hateful Mode". This mode cannot be deactivated until the game is reset or the day changes. It's is a reference to the game Hatred. Yandere-chan's uniform will turn into a blackish-gray, and the atmosphere will turn red. As with Slender Man mode, this will set the sanity level to minimum. Metal music plays the whole time in this mode. As such, if you encounter Senpai in this mode, it will result in a "Heartbroken" screen or an "Expelled" screen if you encounter a teacher in this mode.
 * "S" key to activate "Spooky Mode". This mode cannot be deactivated until the game is reset or the day changes. This mode turns all female students and teachers into skeletons and plays Nyanners' cover of "Spooky, Scary Skeletons" by Andrew Gold, in the background. While the female students and teachers are skeletons, their bangs seem to disappear. The reason the male students are not skeletons could be that the player would not be able to tell them apart.

Phantom Girl
If you take a picture in the bathroom on the 3rd floor, a semi-transparent girl about half the size of an average student model will appear in the picture. No matter where Yandere-chan is, the ghost will be looking in her direction.

This character used to be behind the single cherry blossom tree behind the school for testing purposes. If you ran into her, your uniform changed into a red and black color scheme. The outfit change was later removed because many people complained it was a bug. She was eventually moved to the bathroom because this was was where she was originally killed.

YandereDev says if people wish to have the uniform back, then you must customize the uniform texture yourself.

Starting screen
After about 10 seconds, the screen title will show the darker side of the game for a short amount of time, this 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 as well.

You can make the "insane" title screen last longer by repeatedly tapping the space bar.

If you press "F1", "F2", "F3", "F4", or "F5", you can change your uniform on the main menu screen.

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

Opening Screen
On the opening screen as of the November 1st Yandere Simulator Update when pressing the "Y" key, Yanvania: Senpai of the Night will start as if you had gone to Yandere-chan's room at night to play it. When you finish the game, it will end with the Afterlogue and then the disk error and you will be in Yandere-chan's room in the morning in your pajamas instead of your uniform.

April Fools
For April Fools 2015 YandereDev released Super Yandere 64 and Kuudere Simulator.

Super Yandere 64
This game is a Super Mario 64 remake in Unity with Yandere-chan instead of Mario.

Kuudere Simulator
Kuudere Simulator is the opposite of Yandere Simulator. The main character doesn't want a Senpai and sits on a chair inside of a room. There is also an option that lets players activate a "Tsundere Mode", which causes Kuudere-chan to switch to her alter ego, Tsundere-chan. If done right, she'll say the word "Baka" at the push of a button.



Easter Egg Students
Pippi Osu, Midori Gurin, Mai Waifu, and Ryuto Ippongo themselves are Easter Eggs.

Pippi is from a game called Osu!, Midori is based on the character Tsuruya from The Melancholy of Haruhi Suzumiya, Mai Waifu is based off of YandereDev's dream anime girl, Kuu Dere is based on Rei Ayanami, and Ryuto is based on Ryuta Ippongi from [https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan ''Osu! Tatakae! Ouendan], and was also a cameo mascot for Osu!''.

Miscellaneous

 * There is an Undertale Easter Egg on the school lot. There is a room with a piece of cheese near a mouse hole to the east of the entrance. It is near the back of the school, to the left of the Meeting 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." It is direct reference to one of the lines from Undertale.

Bugs

 * Titan students run into walls, get stuck, and usually move backwards.
 * When a titan is killed through whatever means, the ragdoll base collapses in on itself, and the body turns into a ball of flesh and rolls all over the place. YandereDev has stated that the bug is too humorous to fix.
 * Some decoration Easter Eggs obstruct the camera view, such as Bancho Mode.
 * Going on all fours and then pressing "Shift" and running in Cirno Mode will make the front part of your skirt disappear.
 * In DK Mode it is hard to mop up blood because when the player picks up a mop, the mop grows and moves through the floor.
 * Yandere-chan cannot hold a weapon properly while insane in Cirno Mode. The weapon floats in the air and goes through her body.

Trivia

 * If Yandere-chan becomes a male, then the 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 you manage to collect all 10 Magical Girl Miyuki manga, then you can also unlock a magical girl Easter Egg.
 * You used to be able to press "C" to disable copyrighted music. With Cirno Mode now available, it has been shifted to "D". "M" also seems to work.
 * YandereDev's favorite Easter Egg is Punished Mode.
 * There used to be a bug that was patched where if you went into Hatred Mode and changed in the Shower Room, your entire body would warp into a terrifying inhuman figure. This was later fixed.SWEETJESUS.png
 * Many current Easter Eggs contain copyrighted music. Eventually all copyright music in Yandere Simulator will have to be replaced with composed original sound alike music. If nobody volunteers to compose replacement music or if there is no budget to do so, then the Easter Eggs would have to be removed from the game entirely. If people still want the Easter Eggs, then YandereDev said he would keep the silly costumes in the game but no music at all.
 * There may be a Sonic Easter Egg where Yandere-chan is naked, covered in blue body paint, and moves at 10x speed.
 * People without an AI are not affected by any mode, such as the the debug build nurse and Rival-chan.