There are some special Smurfs in the game, that means not the general, working Smurfs, but the individual Smurfs, like Vanity Smurf. Some of them have to be unlocked by reaching a certain level and then bought with Coins, others have to be bought with Smurfberries and a few of them return to the village completely free and without the need to build a house for them.
Every one of those special Smurfs helps with the village in one way or another, some give bonus XP or add new features and others come with their own mini-games.
The different mini-games can be played every couple of hours for a reward (go to the mini-game (by tapping it) to see how long to wait until it can be played again). During the time the mini-game does not give a reward it can still be played to practice for the next time a reward can be gained again.
Every task that has been completed in those games gets rated either “smurfy” for very good, “good” (sometimes “ok” instead of “good”) or “poor”. To receive a reward in the form of Coins and XP the rating must be at least “good” but if it is “smurfy” the reward will be higher.
As soon as a mini-game can be played for a reward again, a sign appears above the house with an identifying symbol (for instances Papa’s Potion Game sign is a purple potion).