Summary: This is a great add-on for Costume Quest. You must already own the game 'Costume Quest' for this to work. The game itself has two modes. In one, you are cute kids in crummy costumes collecting items and exploring a cute world. In the other, the battle mode, you are awesome fighters, such as a huge robot or a giant snow monster, fighting 'Grubbins', monsters who want to steal all the candy of Halloween.