I recommend "Battle Royale"

https://www.battleroyalefilm.net/

Edit: ok lemme tell you a tiny bit about this movie...it is a japanese movie with lots of gore...the premice is that this is a survival program, almost like a game, where the players must kill eachother until the final few remain...if that wasnt bad enough, they are on an island surrounded by cliffs, and every so often a player is chosen and "removed" from the game at that time. Each person is fitted with an un-removable explosive collar, if removed...it explodes. Before the game/program even begins someone gets a knife in the forehead and a collar is exploded....it is a great movie :P

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