Rank 6 is the rank following Rank 5. It unlocks 2 different researchers: Derek Keeblander, who automates and speeds up Miners, and Dr. Shortstack, who increases the chance of getting bonus resources of ALL industries. It is the first rank that lets the player complete 3 missions at once. Completing 10 out of the 12 missions is the requirement to be able to rank up to Rank 7.
This rank also unlocks Special Operations, where a player can complete tasks to earn more rewards.
|1||Promote Researchers||Upgrade 2 Cards||Wood|
|2||Science Rules!||Collect 125 Science||Wood|
|3||Pave the Way Forward!||Own 1,000 Roads||Wood|
|4||More Potatoes, More Glory!||Collect 500 BB Potatoes||Stone|
|5||Plantation Association!||Own 10,000 Plantations||Wood|
|6||Pick a Card! Any Card!||Collect 20 Cards||Wood|
|7||Stronger than Dirt!||Collect 1 M Ore||Wood|
|8||Excava-Terrific!||Own 1,000 Excavators||Wood|
|9||Earth Shattering Kaboom!||Own 10 Blasting Sites||Stone|
|10||R&D Asap!||Spend 250 Science||Wood|
|11||Sewer Pursuer||Own 100 Sewers||Wood|
|12||Grow-It-All!||Own 10 Irrigations||Wood|