Each game of Mahjong that is successfully completed will earn you 3 crowns which are applied to your progress within Dragon Road. Dragon Road offers multiple levels, each level unlocks new rewards: tile sets, backgrounds or board shapes.

To check your current level, and what you will unlock next, access the Board tab in the bottom menu bar. The bar on the left shows how many crowns you have acquired and how many more crowns you will need to unlock the next reward, and your progress to reach the next Dragon Level.