I have a friend of mine who loves Battle Royale (since my circle of friends consists mostly of anime fans of various levels, it was bound to happen) and he reminded everyone that the Hunger Games was a rip-off every time we saw the later. I understand where he comes from, there's a couple similarities, but I once found a eight or nine year old scribbles, of when I was 12 or 13, about a story that I was making called "999 Bloodsheds", the basis was that one thousand people were locked inside a city, each with a random weapon of various levels and a random tattoo of a number (because fuck names) and the doors would open one at a time. The members would have to kill each other until one was left. I even remember I had the idea that it was for the story to start with #1 grabbing his gun and running around the corridor just to be shot and revealed that he wasn't the main character at all and that everyone could die there, I thought I was being smart.