Far Cry 2

You play a mercenary sent to kill an arms dealer called the Jackal, caught between two factions in an unnamed African country tearing itself apart. The game works against its own genre on purpose. Your guns jam and degrade, malaria attacks hit at the worst moments, and the open world has you driving long dusty roads through checkpoints that respawn and grind you down. It is more frustrating than fun in the usual sense, and that is the design. It wants the war to feel pointless and exhausting, and it wants you complicit in it. A strange, cynical game that has aged into a small obsession for some.