Bad Time Mode

Bad Time Mode is an Easter Egg Mode in Yandere Simulator.

NOTE: Because the developer of Undertale is not okay with this Easter Egg in the game, this mode will eventually have to be removed.  

Appearance
This mode is a reference to the video game Undertale. Press U to activate the mode. It cannot be deactivated until the game is reset or the day ends. Yandere-chan will resemble the character Sans from said game. She will have light grey skin with black eye sockets. She will be bald, and when any special attacks are used, her left eye will glow blue. The player will not wear a uniform, but a blue jacket with black pants with white striped. The song "MEGALOVANIA", Sans' battle theme, will play in the background. This music will eventually be replaced as to not be copyrighted.

Attacks
During this mode, the player can use several attacks that Sans uses during the Genocide Run to kill students, teachers, and Senpai.

Gaster Blaster
If the player presses the Left CTRL button, a large skull called a Gaster Blaster will appear and shoot a white Ray that will kill anything in its way. Pressing the CTRL button a second time will make two Gaster Blasters appear, pressing it a third time will make three Gaster Blasters appear and so on when pressing it a seventh time resets the amount. The player can use the Blasters to kill Senpai.

Psychokinesis
It is impossible to interact with any student in this mode as the button for Psychokinesis replaces the talk or attack button. Once close enough to a student or teacher, the player can pick up them and throw them around. Students who witness the floating corpse will treat it as a random corpse, so no heroic or strict teachers will come to attack the player. Since Senpai has his pink aura surrounding him, it is not possible to use psychokinesis on him.

Bone Attack
If the player holds down the Left CTRL button, many bones will rise from the ground within a short range. Any student or teacher that comes within contact with a bone will die instantly. The bones will appear through any prop, including walls. This bone attack can be used to kill Senpai.

Bugs

 * The player's textures will glitch if she wears gloves.
 * The player will loose her skin texture if she goes nude in the Shower Room. If she puts on a uniform, she will revert back to Yandere-chan, but with her powers still activated.

Trivia

 * If Senpai is killed in this mode, he will respawn the next day.
 * The player can press D to disable the copyrighted music.
 * This mode was implemented in the January 15th, 2016 Build.
 * YandereDev has stated that Osana Najimi will perform the same hip swaying animation as "Sansdere-chan", the nickname he gives to Yandere-chan during this mode.