Battle Royale is a 2000 Japanese film directed by Kinji Fukasaku. In the film 42 9th graders are sent to a deserted island. They are given a map, food, and various weapons. An explosive collar is fitted around their neck. If they break a rule, the collar explodes. Their mission: kill each other and be the last one standing. The last survivor is allowed to leave the island. If there is more than one survivor, the collars explode and kill them all.