Pets can perform various tasks within constraints, which can be widened by increasing their level. To increase a pet's level, experience potions are required. The experience level is displayed in the pet menu, and a fraction of the total experience in your collection is applied to each pet when clicked. The pet's level and relevance to helping you increase automatically once you accumulate enough experience points. Each pet has a unique experience curve, and each level up independently. Each pet gains experience for each action it completes, which it can spend to advance in level.