If I had to pick, The Elder Scrolls IV Oblivion is probably my favorite game of all time. I cannot put into words how important Oblivion is to me. It was one of my very first PC games I ever purchased, and I have easily invested thousands of hours into it as a kid (before acquiring it on Steam). It introduced me to the "Elder Scrolls" franchise, and to open world RPG's. Never has a game before it impacted me, as a kid, as Oblivion has. An easy 11/10 game. I love it, and I hope you'll love it too.

P.S. - Get Fin Gleam asap! You'll thank me later!