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Manhunt/Manhunt 2

First released in 2003, this grisly game is filled with unflinching acts of sadism, as your character is ordered to kill others – brutally – using stealth and a variety of tools (in one execution, you suffocate someone to death with a plastic bag). The level of violence led many to question why it had been given an M rating (gaming's equivalent of an R-rated movie) versus an AO (the gaming version of NC-17). Controversy fueled sales, though. Take-Two has sold more than 1.7 million copies of the games.

Photo: Rockstar Games