Elite. The best video game ever, for it's time (1985). The first 3D game, one of the first games with a never ending gameplay, scientifically correct physics, fractal generated content, eastern eggs, no bugs. Based on 2001 Space Odyssee, bundled with a SF novel. Still very impressive. Successor 'Elite Frontier' simulated the whole Milky Way in the year 2300 with star systems, planets, moons, even weather.