Research upgradeExtra Iron Storage II
+ 20,000 iron storage capacity
Research data
- Research branch
- Iron mine
- Unlock requirement
- Iron mine level 2
- Cost rank
- 13
- Wood cost
- 3,000
- Stone cost
- 3,000
- Food cost
- 3,000
- Gold cost
- 1,500
- Iron cost
- 4,500
- Effect
- + 20,000 iron storage capacity
Related game data
Research branch 1
Research cost 5
