What's a video game that changed your entire gaming experience?

Dark Souls 3 was my first From Software game, and it changed how I approach video games.

I played Bloodborne, Demon's Souls, and Elden Ring after that, and in each game I had to learn to be more patient in order to learn boss fights, recognize patterns on the fly, and react quickly. I felt like I actually gained the skill of breaking down a difficult fight into its components, and it made many games after that much easier. I recently beat Hollow Knight and was able to use the same strategies I learned from playing the Soulsborne games in order to beat difficult bosses.

What games in your life affected how you experience video games, and how?