Helping your friends is easy, profitable, and very simple. When you're asked for help, you'll see an exclamation mark on the Friends menu. Tap on the icon of the player you want to help and you'll be taken to their farm. You can help your friend fill crates on the train or load barrels on a steamship. As a reward for your help, you will receive stamps. The stamp is given only after your friend accepts your help. These stamps can then be used in the House of Luck.