Amongst the rewards, you will also find a special item – Timber Packs. Use these Packs to upgrade the House of Unity and further improve your Resource production. You may upgrade the building to a maximum level of 10, which will provide a 20% increase to your Resource production.
You can earn rewards for:
1. Each Friend that joins the game and connects it to Facebook.
2. Each invited Friend that reaches Level 15 in the game after linking it to their Facebook account.