Whether you started with a 2600 and a joystick in your hand, an N64 with a blistered palm or building your first PC in your teens, what is that one video game you've played at some point that to this day sits at the top of your list.
It might sound dumb, but Guardian Tales. It's a gacha game on mobile and Switch, but I really love it. The story is great, it's fun to play, and the devs are very generous. I've played it multiple times on different accounts just because I have so much fun with it.