Mushroom houses or huts, are the housing of smurfs, and are nessesary to obtain smurfs.
Upgrades
Huts can be upgraded 2 times, the first time with 500 gold and the second with 4 smurfberries, every upgrade will add a smurf and change the appearance of the hut.
Cost
min. 30 gold in village
min. 3000 on swoof planet
min. 1500 on island