If you had to play only one game for the rest of your life , What Would It be?

One of the S.T.A.L.K.E.R. series. It has trillions of mods and always something new and unique. It's difficult so I couldn't just finish it as fast. It has horror, action, puzzles, atmosphere, relax and everything that I can take my time with. I can do whatever I want in the game and the explorable area is big especially with mods.
But I would consider GTA 5 and Minecraft too.