Nintendo

Zelda BotW and TotK (previous Zelda games would be in my All Ages tier)

I'd consider frankly pretty much all Zelda games more mature. I haven't played them all, but the pattern I've noticed is that the more recent games feel easier (though the open world makes them more time consuming). The bigger puzzle dungeons of older games could get quite difficult sometimes. Easy to get lost and confused. The 2D games often were extra cryptic and combat was more punishing.

As a kid, I bought oracle of ages as my first ever Zelda game and couldn't figure out where to go after the first dungeon, so had to sell it. As an adult, I beat it and the seasons equivalent just to see what I missed out on. I had to use a lot of save states and recall some bizarre minigame that was just horrible, horrible, horrible (90% of my save states would have been that one minigame). I had to Google multiple times where to go. I dunno how kids could do it. Sometimes I wondered if it was all a ploy to make kids call that pay number for video game tips that predated the internet answering all these questions. Also, I seriously question why I even put myself through that. It wasn't that fun.