I'd probably say Counter-Strike: Source. I've played close to a thousand hours over the years due to the sheer amount of variety in maps and game modes.
Unfortunately all of my favorite servers are dead now and that makes me sad.
I played it for a couple hours and caught about 40 pokedudes from my house. It wasn't spectacular or anything, but the AR aspect was interesting enough to keep me amused.
Unfortunately living in a rural area has made the game basically unplayable now that I've run out of pokeballs. Pretty disappointing.
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