Yeah Counter-Strike Global Offensive definitely. I've been playing CS more than 10 years, since CS 1.5 came out. I played CS 1.6 too but Source I skipped. There is no good reason for that, the scene in CS 1.6 was just still so strong and I liked the game mechanics more, so I never made the switch to CS:S. Then came CS:GO, players had started to disappear from 1.6 and I gave it a try. Now I play nothing else.