I have this on Steam rather than GOG just fyi. Anyway, Factorio is the platonic ideal of a video game; it balances short-term and long-term objectives, goals, satisfaction, and a constant array of growing and interlinked puzzles. At no point is there an opportunity for boredom to appear, as there is always a new patch of ore to exploit, a factory complex to expand, a train line to extent, or optimization to perform on your existing factory.
SimCity 4 is the pinnacle of the city sim genre. It is a superb, huge game that will suck up the hours, and that's before you even start talking about the gargantuan number of mods available.
