Upgrade your Coal rank to:
| Coal ----> Iron | 5.00 3.00 USD | Buy |
| Coal ----> Gold | 15.00 9.00 USD | Buy |
| Coal ----> Lapis | 20.00 12.00 USD | Buy |
| Coal ----> Emerald | 30.00 18.00 USD | Buy |
| Coal ----> Diamond | 45.00 27.00 USD | Buy |
| Coal ----> Bedrock | 60.00 36.00 USD | Buy |
| Coal ----> Legend | 75.00 45.00 USD | Buy |
| Coal ----> Immortal | 105.00 63.00 USD | Buy |