It was about a group of people who went to participate in what they thought was a game show to win money. It takes place on an island and the people playing get split up into different teams. I remember them having to fights zombies to survive and make it to the end. At the end there was a boss like creature, the team had a choice to leave or fight him for the money. They fought him and won then got on a boat to leave and was ambushed on the boat by more zombies.