In the past this would of been Shadow of the Colossus. They occupy the same space for me, they both tell a timeless story (for me one is a about doing anything for love, the other is the hardships and acceptance of death) and they tell the story in such a way that gets you caught up in the experience without telling you outright the story. Seeing how a game can do this effectively is something i consider everyone should experience and that is why it made my list.
Now this game might not be for everyone but i think everyone should try to see what its about. A truly open-world game, you can pretty much do everything, do nothing at all, or both in a sense. The fun in this game is almost entirely up to the player's creativity and that is the best thing about the game and the reason why its on my list.
This third game was hard to choose. I felt like I needed a 3d platformer for some reason and i chose my favorite. Spyro had some great platforming in vivid interesting environments filled with quirky characters with great animations. This may not be the first 3d platformer but i think its the best and should be played