How I can start again whole game?

In the top left of the start screen, click the Plus in the top right to start a New Game (as opposed to creating a new family). This should generate a world in the defaultt state, so you can start from scratch. 

Its easy all you need to do is load the game up so it on the home screen. Then there is a load game thing aat the top. Click that then click delete ( there should be a x when you hover over) after that press esc on ur keyboard and you are done its really easy!😕mileyvery-happy: