Factorio, the talos principle, the witness, portal. Intellectually stimulating is a pretty broad net however. I find starcraft 2, rocket league, CIV, CS:GO, sim

Factorio, the talos principle, the witness, portal. Intellectually stimulating is a pretty broad net however. I find starcraft 2, rocket league, CIV, CS:GO, sim city, flight sims, racing games (dirt rally), to be all "intellectually stimulating".