[ねこまっしぐら]

SAO definitely isn't the first. However, it is one of the most well-known in that setting. I tried to watch Log Horizon and really couldn't get into it for some reason. I may try and watch it another time, but I got bored initially.

I have watched several of the big anime set in games and this one is just one of the most recent additions that I really like :') I recommend you give this a go. It talks more about leveling up, status, abilities. Not as in depth as it maybe could have been, but definitely still good.

And SAO is the one that you recommended that I recommend to my ex girlfriend. Those were good times.