There are several characters in the first Hunger Games that revel in the death of their competitors, including several that torture their victims to death. A number of the competitors go into the games knowing what they involve, having specifically trained to kill other children.
In the second and third Hunger Games novels, the traps and obstacles are designed to torture, maim, and/or inflict painful deaths, for the viewing pleasure of those watching (in the second) or just to inflict pain (in the third). At the end of the final novel, the "good" guys murder a bunch of innocent civilians (including children) in order to assure their ascendancy to power.
In terms of darkness, the Hunger Games is darker than Battle Royale. But it's not a direct comparison, since Battle Royale is a satire and Hunger Games is not.
In the second and third Hunger Games novels, the traps and obstacles are designed to torture, maim, and/or inflict painful deaths, for the viewing pleasure of those watching (in the second) or just to inflict pain (in the third). At the end of the final novel, the "good" guys murder a bunch of innocent civilians (including children) in order to assure their ascendancy to power.
In terms of darkness, the Hunger Games is darker than Battle Royale. But it's not a direct comparison, since Battle Royale is a satire and Hunger Games is not.