How is this book idea?

I love the story in the Hunger Games, and I wanted to write a book somewhat like it, except with a twist: A group of kids are mutated and have special powers which they don't know about, and scientists are working an experiment in which they place all of the kids in an enclosed arena and they see how long it takes the kids to figure out their powers, then they must fight until only one person is left. Too unoriginal?