The rank of buildings and event locations increases as you beat levels.
The rank progress bar fills with each successful exploration. When it reaches 100%, the location moves up a rank.
There are a total of 8 ranks:
- I is for Apprentices
- II is for Carpenters
- III is for Thatchers
- IV is for Builders
- V is for Foremen
- VI is for Designers
- VII is for Architects
- VIII is for City Engineers
The rank you need to reach is displayed in the Building or Event Location Preview Window.
As the rank gets higher, it increases the following:
- Energy cost and the number of items required to enter the location
- Number of items to find inside the location
- Exploration rewards.
Rank also determines which chargers and collection items you can get from that location.