Best game of all time?

I'm interested to know what everyone's favorite games are, and why. My favorite game is a tie between Kings Field and Kings Field 2. I love these games because they are like classic doom in terms of gameplay and feature lots of non-linear exploration fun. It is a fantasy action rpg where you battle monsters in real time with swords and magic. These games are really old, being for the PS1 but I think they are well worth playing. As a note, I first played Kings Field 2 and hated it until I got fire magic, from then on it was pure love. What about everyone else? What do you think is the best game? Take care.
-calimer