The iron warehouse is the place to store the iron you receive through prizes and from your mine. You gain access to an iron warehouse when HQ reaches level 9. The higher the level of the warehouse the more iron can be stored at any given time. Iron is used for purchasing buildings and upgrades. There are a total of three iron warehouses to access during the game. To upgrade your warehouse, the HQ has to be at a certain level.
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Level |
Iron Capacity |
Xp gained |
Upgrade cost |
Upgrade time |
Instant upgrade |
HQ level needed |
|---|---|---|---|---|---|---|
|
1 |
4,000 |
+15 |
30000 wood 7500 stone 1800 iron |
5h |
9 | |
|
2 |
8,000 |
+20 |
48676 wood 13888 stone 3447 iron |
5h50m12s |
10 | |
|
3 |
16,000 |
+26 |
81405 wood 24072 stone 9285 iron |
6h46m27s |
11 | |
|
4 |
32,000 |
+31 |
125779 wood 42554 stone 19997 iron |
8h4m30s |
12 | |
|
5 |
64,000 |
+38 |
215478 wood 110848 stone 44507 iron |
9h49m56s |
13 | |
|
6 |
125,000 |
+44 |
352756 wood 171665 stone 80288 iron |
11h46m13s |
14 | |
|
7 |
250,000 |
+51 |
632411 wood 332878 stone 179364 iron |
13h54m16s |
15 | |
|
8 |
500,000 |
+58 |
1168626 wood 590438 stone 362511 iron |
17h36m45s |
16 | |
|
9 |
1,000,000 |
+64 |
1701111 wood 1123558 stone 680447 iron |
21h19m1s |
17 | |
|
10 |
2,000,000 |
+77 |
2314023 wood 1812785 stone 1800702 iron |
1d4h53m1s |
19 |