I've never liked Truth or Dare as a game and the movie is a great example of why. Truth is so different than Dare and both are kinda terrible. I have never understood the allure of the game in the first place. If the person lied or hid stuff before, some silly game isn't going to make them suddenly divulge more information. But in the movie, if you lie, you die. But the rules in the movie make little sense, either. And the movie wasn't really scary, just kinda creepy, I guess.
Blumhouse's Truth or Dare follows a group of friends that go to Spring Break in Mexico and are lured into an old ruin where they are cursed to play a real game of Truth or Dare. Fail and you die. Refuse and you die. But the demon that is cursing them can basically request anything, so it's a pretty poor concept to begin with. The worst is the 'dare' to tell the truth about something. The demon can even possess them to have them do whatever it wants.
The thing about scary movies is that you need to have some set of rules. It's not scary if it's just a world without hope. That's what apocalyptic movies are for. There needs to be a way to win. But this movie sets up rules just to ignore them. The demon could have just done, "I dare you to kill all of your friends" or "I dare you to kill yourself". If it was just dangerous or stupid stuff, that would have been more interesting, but by the end, it was just so dumb. And not scary. Bethany kept thinking she'd be scared, but nope. Just not a very good movie.