Fate/stay night, Darwin's Game Recommendations
The Fate series are considered a battle royale masterpiece, with the main protagonist accidentally dragged into the race, after which a grand story of struggle for life and love follows, mixed with mystery, suspense and action. Darwin's Game tells a similar tale, albeit perhaps in a slightly less "epic" setting.
Both shows are involved in a situation where fighting to death is inevitable and you need to survive. In both shows the MCs are similar in their way of thinking (their morality and ideals) and also have more or less the same power. I found Fate better because of the world-building depth and magic rules, and way more original.