There's also one that is about how the entire earth is actually just a very powerful computer that calculates what's the question to the answer of the meaning of life.
Also I think something very similar happened in the 3 Body Problem trilogy at some point
Trisolarians apparently at some point formed a computer out of the members of their species in order to try to predict the Chaotic Eras, it was presented as experiment to the humans in trisolarian VR game, that was very close to the beginning of the book.