Buildings and Event buildings have Rank, which increases as you complete levels.
Each successful exploration you complete increases the Rank progress %. When it reaches 100%, the Rank of the location or mini-game increases.
There are 8 Ranks in total:
I—Carpenter,
II—Stonemason,
III—Sculptor,
IV—Artist,
V—Surveyor,
VI—Designer,
VII—Architect,
VIII—Town Planner.
The Rank number is displayed in the Location Entrance window.
As the Rank increases, so do:
- the energy cost and the number of items required to enter the location,
- the number of items you can find inside,
- the rewards for exploration.
Also, the variety of collection items and items for assembling collections you can obtain changes with each Rank.