What game do you consider to have the most challenging gameplay mechanics?

[Scorpion]

Which game do you believe possesses the most challenging gameplay mechanics, and what specific aspects contribute to its difficulty? Discuss elements such as combat systems, puzzles, or overall game design that push players to their limits and create a demanding experience.

[killamch89]

I consider 'Dark Souls' to be one of the most challenging games out there; its punishing difficulty, precise combat mechanics, and relentless enemy encounters force you to constantly adapt and master every nuance of the gameplay.