Research upgradeExtra Iron Storage IV
+ 80,000 iron storage capacity
Research data
- Research branch
- Iron mine
- Unlock requirement
- Iron mine level 4
- Cost rank
- 17
- Wood cost
- 20,000
- Stone cost
- 20,000
- Food cost
- 20,000
- Gold cost
- 8,000
- Iron cost
- 12,000
- Effect
- + 80,000 iron storage capacity
Related game data
Research branch 1
Research cost 5
