The Elderscrolls series by far from Bethesda Studios, I have played each TES game going back to Arena in 94 on my first PC (386 40 mhz with 2MB of Ram) I really don't want to add up the hours over the years on each TES release but to give you an idea in TES 5 Skyrim, I have already put 600+ hours into 2 charachters! Totally hooked by the open-style free to roam gameplay, always loved it! The graphics and gameplay don't hurt either, love bashing Orcs over the head with massive hammers and axes haha, and in 1920X1080 it looks stunning with Day/Night cycles and realistic weather.
After TES it would be Half-Life and HL2.
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