What is your FAVORITE single player video game of all time.

My favorite singleplayer games of all time are Dead Cells because I really enjoy the concept of having no checkpoints, and furthermore, it's executed really well, even though I was dying over and over again, I always made some kind of progress compared to my last run; Zelda Breath of the Wild because it is a breath of fresh air compared to older Zelda entries, as it doesn't rely on the concept of getting an item to progress through an area that was blocked before, instead the whole world is available to you after you complete the first area of the game, another thing I really like about this game is the fact that it encourages exploration of new areas, as the map is full of beautiful landscapes and filled to the brim with interesting stuff to do; and finally Civ5 because it was the game that made me hooked to strategy and 4X games. The game's mechanics are really refined, making for an outstanding experience.