Most competitive games if you want to play at the highest level are extremely tactical and thus intellectually engaging. Top players all have top tier mechanic

Most competitive games if you want to play at the highest level are extremely tactical and thus intellectually engaging. Top players all have top tier mechanics and then it mostly comes down to tactics, the ability to metagame etc. I personally enjoyed Dota in the past, for that reason, although I currently play games with smaller multiplayer sessions.