Yandere Simulator

A game in which you are a Yandere and must eliminate rivals for sempai's affection. Created by YandereDev as a stealth action game, the goal is eliminate all rivals for the affection of a boy your character likes while keeping everyone ignorant of it.

It is still in development, though builds of the game can be download as they are created.

The game is currently PC only, though Mac and Linux builds are possibilities for the future.

Tropes used in Yandere Simulator include:

A Date with Rosie Palms: One of the ways to regain sanity is to use a picture of sempai. It's implied that you might be masturbating to him.
Bitch in Sheep's Clothing: It's possible for Yandere-chan to mercilessly wipe out her targets without anyone suspecting that someone as innocent or normal as her could have done it.
Censor Steam: When someone is naked.
Dirty Business: A Hero Antagonist of the lore does this. The disgraced reporter concludes that he needs to let a murder happen so he can have a serial killer put in prison, reasoning that if he tries to save the girl who he thinks will die, even more murders will take place, and the killer will get off scot free again.
Driven to Suicide: You can bully a student so hard that he or she kills him- or herself.
Emotionless Girl: Yandere-chan's backstory implies that she was this, until she saw Senpai.
Evil Laugh: If you commit a murder you lose sanity. Giving a evil laugh calms you down.
First-Name Basis: Ryoba's darling starts calling her by her first name shortly after they start talking for the first time. Isn't it romantic?
Generation Xerox: Ryoba Aishi, Yandere-chan's mother, is not only stated to look like an adult Yandere-chan, according to Word of God. But it's strongly implied that Yandere-chan even took her Yandere tendencies from her mother, too. Whether or not she fully embraces it like Ryoba has, is up to you.
It Was Here, I Swear: You can clean up a murder between when it is spotted and when a teacher shows up. The teacher scolds the student for "playing a prank".
Make It Look Like an Accident: If you poison someone's food, it is assumed that the person choked on his or her food, as long as you don't try to dispose of the body.
Murder the Hypotenuse: It wouldn't be complete without this. Perhaps surprisingly, you don't need to kill your rivals to eliminate them.
Parental Abandonment: Yandere-chan's parents are nowhere to be found. It's temporary (story wise) because they're on business in America. In practice they are going to be gone for pretty much if not flat out the entire game. and Ryoba Aishi is hunting down the journalist who discovered her Yandere side back in the 1980s.
Obvious Beta: The game is still very much a work-in-progress and YandereDev makes it clear with each update that there are several features and improvements yet to be implemented. Probably the most obvious examples are the club leader's that are just place holders, introduced in the Febuary 1st 2016 update. YandereDev out right stated that they are place holders and won't react to murders that happen right in front of them. Furthermore they are all identical and are completely devoid of any personality. All they do is let you join their respective club.
Police Are Useless: Subverted. The police would suspect and arrest Yandere-chan if there's too much evidence implicating her out in the open.
Reality Ensues: Trying kill a teacher without the proper method or the right skills is a guaranteed way for Yandere-chan to have her ass apprehended. Likewise, simply going about murdering everyone on sight won't just send your sanity down rock-bottom, but would also make the game a lot more difficult.
Sanity Slippage: If you let your sanity go too low, Yandere-chan begins to visibly twitch and lunge about like a deranged killer.
Stalker with a Crush: Yandere-chan has a rather deep obsession with Senpai, to the point of having a full-fledged shrine on her bedside dedicated to him. Whether she can be blatant about that or mask it as much as possible is up to you.
Yandere: Duh. This runs in the family supposedly going back at least EIGHT generations.