It's about 50 random people getting abducted by some "aliens" and have to play a game where they all vote for one person to die every 2 minutes.
I thought it was a really interesting movie, kind of low budget but there was a diverse set of actors/actresses. Every single person in the game had their own moment/death and it was really tense throughout.
The ending was really shocking though, I didn't really expect it.
I really liked how the contestants thought of everything to "trick" the votes but they all failed.