The Shadows

The world is destroyed, three fouths of the population dead. Most of the people that are left are teenagers, but some greedy, brutal millionaires live. They have their scientists capture the teenagers and genetically modify them, then release them into the treacherous world to fight to the death with deadly creatures and other teens. And unless you find a group to work with, you're as good as dead...

Fyi: This is NOT intended to be a spin off of Hunger Games or The Maze Runner trilogies. Enjoy!