Castle

The castle is the area where are placed your buildings

Expansions
There are 5 expansions in the game. Each one costs always more and need always more time. You unlock the first expansion in the tutorial. The last one costs 2'000'000 Gold and need 2 days to be unlocked. In the expansions you can place all your buildings. For each expansion you buy you will have available 4 new spaces where place buildings, counting dimensions of a fountain.

Buildings
In the expansions you can place each kind of buildngs (from fountain to training field), but there are 2 buildings that can't be removed, the Arena and the Fusion master.