The World Master is your simulated tabletop game master. They will build you a unique world, play as long as you like, will never tire of your antics, and will let you pursue any challenge you wish to take on. However, the World Master will no shelter you from the consequences of you actions or ill-preparedness.
The first step of generation produces random tectonic plates. From that moment forward the system is deterministic. Mountains from along faults, sunlight increases temperature, pressure drives the wind, rain flows into rivers and lakes and out to the oceans. Not dice rolls, physical laws.
Manage your resources wisely. Food, water, sleep, and equipment. It's relatively safe within a days walk of town, but out in the wilds, fresh water is scarce, food spoils quickly, and torches only keep small creatures at bay.
Humans settle across the world, but they aren't the only living creatures shaped by it. Monsters lurk wherever spears and armor don't reach, and sometimes even where it does.
These fantasy worlds are filled with monsters, and when you run into them, you will resolve your differences in turn based tactical combat. Spend your initiative to move and attack, but be careful, you need it to defend yourself as well.
Skills grow as you use them. Any time you use a skill to do something difficult, you gain experience points for the relevant skills and attributes. Adjacent skills are revealed, but nothing is stopping you from training skills you can't see on the web yet.