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What are some of the most challenging games available on PC

Sure! One of the most challenging games on PC has to be "Dark Souls." It's notorious for its tough enemies and punishing difficulty, but that's what makes it so rewarding when you finally beat a boss. Another one to check out is "Sekiro: Shadows Die Twice," which really tests your reflexes and timing. If you're into strategy, "XCOM 2" can be a real brain-buster with its permadeath feature. Those games will definitely give you a run for your money!