Seven friends find a strange board game, which is said to grant anyone who wishes a wish, but any losers will suffer violent deaths as predicted by the game. They don't believe it and start playing.
As each of the players lose the game, however, they begin dying exactly as the game predicted. Now the only way out is to finish the game and pass it on...
Tropes:
- Are You Sure You Want to Do That?: When Jason tells the witch his wish of wanting to go back a week to when they had never played the game, she tries to tell him that it'll put him right back where he started, no better. He, being an idiot, insists on going ahead instead of taking a moment to consider this statement. So it's last week. He, lacking Ripple-Effect-Proof Memory, proceeds to let the exact same sequence of events happen over again.
- Be Careful What You Wish For: Jason's wish for the game is that it was a week ago, and that they had never played the game. He gets it...but also loses any memory of playing the game, too, leaving him trapped in a time loop.
- Downer Ending: Due to Jason's idiocy when wording the wish, he and his friends are now stuck in a "Groundhog Day" Loop of relieving the week, getting killed over and over again.
- Exact Words: Jason wishes that it was a week ago, and that they had never played the game, hoping to undo everything. That's what he gets...he is transported back a week, having never played the game, and with no memory of what happened. He finds the game like he did before, and is now doomed to repeat the events of the movie forever.
- Eye Scream: Pablo is killed after falling off a cliff and getting his eyes gouged out by crabs.
- The Game Come to Life: Every one of the losing players is killed in the exact way the game predicts.
- Genuine Human Hide: The board game is made from the skin and organs of a witch, Mamba.
- "Groundhog Day" Loop: What Jason and everyone else is stuck in at the end of the movie, due to his poorly-worded wish.
- Never Trust a Title: "Open Graves" isn't the name of the game; that's "Mamba". The movie's title is simply a fate said in the game.
- No Ending: The movie ends with everyone trapped in a time loop, doomed to keep playing the game and repeating its events forever.
- Rapid Aging: Lisa suffers from this after losing the game.
- Ripple-Effect-Proof Memory: Averted. When Jason wishes at the end of the game that it was a week ago and they had never played the game, he gets it; including losing any memory of having played the game already.
