Rank 21 is the rank succeeding 
Rank 20. This rank unlocks the researcher Pumbob, who automates and speeds up Deep Bores. Rank 21 has 15 Missions, and at least 12 of them must be completed in order to rank up to 
Rank 22.
| # | Name | Requirement | Reward |
|---|---|---|---|
| 1 | R&D Asap! |  Spend 1,500 Science
|
 Wood
|
| 2 | Earth Shattering Kaboom! |  Own 8,003 Blasting Sites
|
 Stone
|
| 3 | This Land is Your Land! |  Trade 14 Land
|
Stone
|
| 4 | Sewer Pursuer |  Own 160,000 Sewers
|
Wood
|
| 5 | Armed and Glorious! |  Collect 50 DD Bullets
|
Wood
|
| 6 | Professional Burrower! |  Own 2.6 M Mines
|
Wood
|
| 7 | Duck and Coal! |  Own 15 M Coal Plants
|
Stone
|
| 8 | Promote Researchers |  Upgrade 3 Cards
|
Wood
|
| 9 | Ambulance-A-Lot! |  Own 18 M Ambulances
|
Wood
|
| 10 | Land in the Hand! | Collect 40 KK Land
|
Wood
|
| 11 | Exciting Boring Work! |  Own 500 Deep Bores
|
Stone
|
| 12 | Bustling Bunkers! |  Own 22 M Bunkers
|
Wood
|
| 13 | A Healthy People! |  Collect 700 DD Placebos
|
Wood
|
| 14 | Rail Sale |  Own 333 Trains
|
Stone
|
| 15 | Stronger than Dirt! |  Collect 4 KK Ore
|
Wood
|
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