The game saves the village automatically every day. If you want to revert to a previous day or lost your village for any reason you can use the following hidden feature: Start the game, select Options from the main menu and tap Papa Smurf 16 times (not the "Restart Game" feature next to his icon). After the 16th time a new option will be available in the bottom right corner called "Recover Village". Select it to find a list of saved games.