Rank 91 is the rank following Rank 90. No new researchers unlock at this rank. You must complete at least 18 out of the 21 missions available to move on to Rank 92.

# Name Requirement Reward
1 A Healthy People! Collect 911 GGG Placebos Wood
2 Pick A Card! Any Card! Collect 1,600 Cards Stone
3 Hankering for Tankering! Own 3.8 B Tankers Wood
4 Perfect for Nuclear Wessels! Own 22 B Nuclear Plants Stone
5 Better than Friendship! Own 40 B Battleships Stone
6 More Potatoes, More Glory! Collect 3.7 UUU Potatoes Wood
7 Coast Busters! Own 9 B Coast Guards Stone
8 Land in the Hand! Collect 823 UUU Land Wood
9 Promote Researchers Upgrade 2 Cards Stone
10 Fortress To Impress! Own 50 B Fortresses Stone
11 Stronger Than Dirt! Collect 1.2 RRR Ore Wood
12 Coast Busters! Own 37 B Coast Guards Stone
13 More Potatoes, More Glory! Collect 256 WWW Potatoes Wood
14 Red Eye Flight! Own 100 B Airports Stone
15 Stronger Than Dirt! Collect 2.8 TTT Ore Wood
16 Fortress To Impress! Own 113 B Fortresses Stone
17 A Healthy People! Collect 494 KFC Placebos Wood
18 Noob Tube! Own 555,555 Tube Travels Stone
19 More Potatoes, More Glory! Collect 92 XXX Potatoes Wood
20 Fortress To Impress! Own 187 B Fortresses Stone
21 Stronger Than Dirt! Collect 3.5 WWW Ore Wood
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