The concept of FarmSatoshi is very simple to explain. 

Players have to register http://bit.ly/farm-satoshi for an account to start playing the game, which lets you run a farm. The main objective of this farm is to add animals to your barn, sell their produce, and use the money earned to upgrade your warehouse

If you dont want to re-invest in growing your warehouse then you can witdraw your earnings to faucetbox.com or straight to xapo wallet

need a wallet:  http://bit.ly/1U7xbwx
register your farm:  http://bit.ly/farm-satoshi