You've seen the movie, now let's play the game.Nerve
is similar to Truth or Dare, but much darker.
The game is divided into Players and Watchers. Watchers gives Players dares, which they must perform within a certain amount of time. If the Players succeed, they are given money. If they fail or bail, they are penalized.
As this is E, many of the dares would be of a sexual nature, usually involving exhibitionism, public nudity, risk of getting caught, and so on. But as the game proceeds, the dares would get progressively darker, and even dangerous.
For those who haven't seen the movie, when the Players sign up for Nerve, they surrender all of their personal data to the Watchers. As the game progresses, the Watchers can use that information as leverage, essentially blackmailing the Players to take dares they wouldn't otherwise take.
Those who attempt to snitch face severe repercussions, both against themselves and their families. Those who snitch also become owned by the game, forced to play until they win.
I see three groups of player: Watchers, Players, and Extras. The first two are obvious. Extras would be people not playing the game that become randomly involved in the game through dares. For example, if a Player is dared to kiss a random guy, the guy would be an Extra. If a Player is dared to masturbate on a subway, some person watching her might be an Extra.
Finally, Watchers manipulate the dares to create drama. In the above dare, for example, they might dare a player to masturbate on a particular subway car at a particular time, knowing that the Player's teacher (played as an Extra) will be on that subway car. OR they might Dare a Player to make out with another Player's significant other, hoping to cause a fight. Stuff like that.
Depending on interest, I see this as either a group story or a one-on-one with one writer acting as the Player and another writing Watchers and Extras.