Most of the things your bunnies do contribute to your burrow’s experience points (XP), including digging, mining, gardening, and breeding. The more XP you accumulate, the higher your burrow level will rise. However, the FASTEST way to earn XP and level up is to complete the tasks you’ll find listed in the My Goals menu. To access this list, tap the round icon with the clipboard on it, located in the upper left corner of your game screen. Here you’ll find new tasks, and you can track your progress towards existing goals. Completing these will help you level up your burrow quickly and unlock cool new stuff for your bunnies to play with.