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Coins, steel and fuel
Your base runs on three resources. Coins and steel pay for buildings and upgrades; fuel trains your army and prepares support.
| Building | Makes | Per hour at level 1 | Per hour at the top level |
|---|---|---|---|
| War Bond Office | Coins | 200 | 2,979 |
 Steel Mill | Steel | 200 | 2,979 |
 Fuel Pump | Fuel | 180 | 2,681 |
A resource building fills up to what it can hold, then waits for you: tap it to collect. You also win resources as loot in battle.
Storage and the Command Center
The Command Center and the Supply Depots hold your coins, steel and fuel. When they are full, collecting stops, so upgrade them as your base grows.
The Command Center goes up to level 10. Each level opens new buildings and higher levels for the others, and lets you have more of them.
| Command Center level | Cost | Build time | Storage |
|---|---|---|---|
| 1 | Free | — | 3,000 |
| 2 | 1,000 coins | 1m 0s | 5,700 |
| 3 | 2,600 coins | 3m 0s | 10,830 |
| 4 | 6,760 coins | 9m 0s | 20,577 |
| 5 | 17,576 coins | 27m 0s | 39,096 |
| 6 | 45,698 coins | 1h 21m | 74,283 |
| 7 | 118,814 coins | 4h 3m | 141,138 |
| 8 | 308,916 coins | 12h 9m | 268,162 |
| 9 | 741,000 coins | 1d 0h | 509,508 |
| 10 | 1,778,000 coins | 2d 0h | 968,065 |
Engineers
Each engineer works on one building at a time. Extra engineers are hired with diamonds.
| Engineer | Price |
|---|---|
| 1 | Free |
| 2 | Free |
| 3 | 250 diamonds |
| 4 | 500 diamonds |
| 5 | 1,000 diamonds |
Obstacles
Trees, boulders and old wrecks grow on your base: a new one every 8 hours, up to 24. Clearing one costs coins and an engineer’s moment, and often finds diamonds.
| Obstacle | Cost |
|---|---|
| Pine Tree | 100 coins |
| Boulder | 250 coins |
| Old Wreck | 400 coins |