I equate gaming skill with intelligence. A lot of videos games would make pretty good IQ tests since they have puzzles and world exploration type stuff. Stupid people genuinely struggle with basic problem solving in games.
Games also display reaction time and basic tactical thinking, competitive online games require that you be good at prediction and planning.
It also filters out something like ADHD kids because they're known to have their ADHD symptoms under control while playing video games due to all the action going on and shifting scenarios. These same people would struggle to stay focused with any kind of written or oral testing.
There are literally people out there who will die repeatedly on level 1 of a simple Mario game. You can glean a lot from how someone plays a game.
Also according to that 4chan post someone linked, I am some kind of high IQ autist who also possesses empathy. I think and daydream abstractly A LOT, I'm always coming up with mental scenarios and making up fiction in my head for my own entertainment. I like doing realistic 3d mental imaging, my mind's eye works in a pretty detailed way. I've had other people tell me that their mind's eye only works in 2D or that they can't do colors and so their imaging is just black and white or something I guess? That seems like a disability to me.
I might be a retarded niggerfaggot fuckhead turdbrained dumblet...but at least I'm not STUPID.