There are some video games, maybe mostly competitive, which certainly do take a lot of mental effort, concentration and insight. Sometimes to the point that tho

There are some video games, maybe mostly competitive, which certainly do take a lot of mental effort, concentration and insight. Sometimes to the point that those gamers can become exhausted from playing those games. I guess the point is that everything can be taken seriously enough to the point that it becomes something which takes a lot of effort (and that effort can be rewarding or stressful).