Play the free demo if you're not sure about this game. Factorio is one of those games where you say you'll do 30 minutes of it and then 10 hours later you've redesigned your entire base. You're always telling yourself "I'll do this later" rather than doing it now. You make production lines for factories, mining ores like uranium, coal, oil and iron and eventually processing them into things like fuel, ammunition, vehicles, rockets, walls. Early on in the game you start off with your bare hands and a single inefficient mining drill. You use that drill to get ores for another drill, eventually you have enough ores for a conveyor belt so you can transport to ores instead of running back to manually collect them. Then after a while you'll have enough ores to design a setup so your mining operatrion fuels itself and unloads itself. As the game progresses you'll start learning about electricity via fossil fuels, and learn the values later on about solar energy and battery backups on your power grid. You'll then learn about nuclear energy all the while the rest of your factory is slowly improving in efficiency, size and speed. If you work hard enough, your hard work will pay off and eventually you can have every single aspect of your factory 100% automated so you can leave your PC while your factory runs. The end goal is to launch a rocket with a satelite into orbit which requires a MASSIVE amount of resources and A LOT of time unless your factory is beefy enough to pump out enough parts effectively. You can also get little robots that fly around and transport things and build/repair stuff for you. Which brings me to aliens.. The larger your factory grows, the more pollution you make which makes the surrounding enemy aliens more agressive and stronger who learn and adapt to your base defences and know where all the weak points are. You'll find the aliens immediately attack a section of undefended border, and once inside go straight towards where the heart of your factory is, and that can be whatever. I once had the aliens enter my base because I forgot to make a turret automatically reload itself, and they immediately ran over to my power station. The problem with my power station is that all it required was a single power pole to be destroyed to shut down power to my entire base, and since my automatic turret reloading required electricity, my base became quickly unprotected and aliens rushed in and destroyed my base. In my next playthrough I learned from that mistake, only to have so much pollution and not enough fortification of my defences to match the aliens growing strength that they broke in and this time ran straight over to my main transport belts of iron and destryoed it, thus choking my factory of iron which is one of the most common ores you'll use. Without iron, things slowly started shutting down one by one and eventually my base started failing and it took quite a while to get the pace flowing again once I killed all the aliens. This game is probably one of my best purchases, every single playthrough is different from the last as I've learned from previous mistakes and know better and more efficient ways to do things before they're a problem again. Not only that but even after several playthroughs when you think you've mastered it, there's other gamemodes like expensive mode where everything requires a lot more resources to craft and build. There's a few other game types but I'm still a noob to the game over 100 hours in, so I haven't tried those gametypes yet. Everything you do in this game feels satisfying, achieving and fulfilling, and it's honestly a bit relaxing sometimes to just stop and watch your factory run like clockwork and think.. I built that

Play the free demo if you're not sure about this game. Factorio is one of those games where you say you'll do 30 minutes of it and then 10 hours later you've redesigned your entire base. You're always telling yourself "I'll do this later" rather than doing it now. You make production lines for factories, mining ores like uranium, coal, oil and iron and eventually processing them into things like fuel, ammunition, vehicles, rockets, walls. Early on in the game you start off with your bare hands and a single inefficient mining drill. You use that drill to get ores for another drill, eventually you have enough ores for a conveyor belt so you can transport to ores instead of running back to manually collect them. Then after a while you'll have enough ores to design a setup so your mining operatrion fuels itself and unloads itself. As the game progresses you'll start learning about electricity via fossil fuels, and learn the values later on about solar energy and battery backups on your power grid. You'll then learn about nuclear energy all the while the rest of your factory is slowly improving in efficiency, size and speed. If you work hard enough, your hard work will pay off and eventually you can have every single aspect of your factory 100% automated so you can leave your PC while your factory runs. The end goal is to launch a rocket with a satelite into orbit which requires a MASSIVE amount of resources and A LOT of time unless your factory is beefy enough to pump out enough parts effectively. You can also get little robots that fly around and transport things and build/repair stuff for you. Which brings me to aliens.. The larger your factory grows, the more pollution you make which makes the surrounding enemy aliens more agressive and stronger who learn and adapt to your base defences and know where all the weak points are. You'll find the aliens immediately attack a section of undefended border, and once inside go straight towards where the heart of your factory is, and that can be whatever. I once had the aliens enter my base because I forgot to make a turret automatically reload itself, and they immediately ran over to my power station. The problem with my power station is that all it required was a single power pole to be destroyed to shut down power to my entire base, and since my automatic turret reloading required electricity, my base became quickly unprotected and aliens rushed in and destroyed my base. In my next playthrough I learned from that mistake, only to have so much pollution and not enough fortification of my defences to match the aliens growing strength that they broke in and this time ran straight over to my main transport belts of iron and destryoed it, thus choking my factory of iron which is one of the most common ores you'll use. Without iron, things slowly started shutting down one by one and eventually my base started failing and it took quite a while to get the pace flowing again once I killed all the aliens. This game is probably one of my best purchases, every single playthrough is different from the last as I've learned from previous mistakes and know better and more efficient ways to do things before they're a problem again. Not only that but even after several playthroughs when you think you've mastered it, there's other gamemodes like expensive mode where everything requires a lot more resources to craft and build. There's a few other game types but I'm still a noob to the game over 100 hours in, so I haven't tried those gametypes yet. Everything you do in this game feels satisfying, achieving and fulfilling, and it's honestly a bit relaxing sometimes to just stop and watch your factory run like clockwork and think.. I built that