When starting a new game in Factorio, you must generate a map that closely aligns with your base building ambitions. You can generate a new map by clicking the randomize button. However, each map generated in Factorio is tied to a string of numbers, called seeds. So, if you ever wish to play a fresh game of Factorio on a map you previously enjoyed, all you need to do is input the map seed number, and you're good to go.