Battle Royale (2000)

A group of ninth-grade students from a Japanese high school have been forced by legislation to compete in a Battle Royale. The students are taken to an abandoned island, each given a bag with a randomly selected weapon and a few rations of food and water and sent off to kill each other in a no-holds-barred (with a few minor rules) game to the death, which means that the students have three days to kill each other until one survives–or they all die.