What is this Japanese movie?!

Question: I can't remember the name of it. It is about these kids who are put on an island and have to kill each other. Only one can survive..but if there is more than one person alive within the 3 day time period then they all die. It was a really good movie I just can't remember the name. 10 points to the first person to give me the answer.

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Answers: I can't remember the name of it. It is about these kids who are put on an island and have to kill each other. Only one can survive..but if there is more than one person alive within the 3 day time period then they all die. It was a really good movie I just can't remember the name. 10 points to the first person to give me the answer.

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Battle Royale.

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