Quests and collection items as well as ingredients for them can drop when you perform in-game activities that require the use of energy points (such as constructing buildings, harvesting crops and so on). Whenever you spend energy points there is always a chance of dropping a certain item for collection or quest. Ingredients for collections can be also bought in the Store -> Extra. Charging collections gives you bonuses while successful completion of quests gives you experience and money to move to the next level.
Have more questions? Submit a request