Equip a population of over 200 adults with steel tools for 4 years.
Every one of your citizens needs to be using a steel tool for the whole duration.
- Check all your blacksmiths to make sure none are producing iron tools.
- If you have some iron tools in your inventory, citizens can continue to use them - make sure you get rid of them all.
- Set your trader to collect every iron tool in your town and trade them for steel tools.
- You will need large amounts of coal to produce the tools - trading can help with this.
- Try to stop citizens using coal to heat their homes.
- Make sure to set the limit for (steel) tools to over 200.