A Booster is an item that allows the player speed up construction, order shorter deals, and shorten the research time of new territories and Anomalies.
You can get Boosters by ordering deals in the Forester's Shed. To order a deal in the Forester's Shed, you will need Sakura fruits.
To activate the Booster, tap the desired object, and select the Booster for 5, 15, 30 or 60 minutes.