Cross base building upgrades grant the player the option of upgrading buildings in several castles simultaneously, regardless of the specific building’s current level. All he has to do to take advantage of this feature is select the appropriate bases and hit the upgrade building button.

Base selection

Bases that have enough resources and subjects and have not yet reached the building’s maximum level can be selected with a simple tap on their cell. Bases that do not fulfill the requirements are faded out and can not be selected.

Speed up/complete building upgrades

All currently running building upgrades can be sped up or completed instantly. It should be noted that all upgrades for any type of building will be sped up or completed.

Expanding the building queue

The player can expand the building queue across all bases for a few water canisters, should the building queue in some bases already have been filled.