Modding is officially supported from day one: official modding tools and Steam Workshop shipped with the Early Access launch VERIFIED. The community Fluxloader is the standard community loader. Note the base game is single-player — multiplayer comes only through mods VERIFIED.
Step by step: download Fluxloader from GitHub, configure fluxloader-config.json, drop mods in the folder, and run with npm start.
Read install guide → Mods · ContentCustom maps are learning sandboxes, not campaign progress. Troubleshoot missing maps, load crashes, and mod-save separation.
Read → Mods · PicksSource-tagged picks: official modding tools & Workshop, the Fluxloader loader, Sandustry Together multiplayer, and custom maps.
Read → Mods · OverhaulBig-change mods in EA week one: what exists, why overhaul-scale content is still early, and honest evidence boundaries.
Read →Start with the install guide, then browse the Workshop. Always download mods only from trusted sources (the official Discord pin).