Energy

Energy is one of the main gameplay mechanics of Harry Potter: Hogwarts Mystery. It is required for most tasks. In tasks, the player has to tap objects 1-5 times (although the required amount can be more in certain tasks), which fills up the progress bar. The player is required to reach a certain number of stars in a time limit or completely fill the bar to complete the task. Energy refills at a rate of one energy every four minutes, and more energy can also be earned by collecting it from energy spots, watching ads, as rewards from various actions or by paying gems. There is a maximum number of energy, which starts as 24 and increases as the game advances, although the required energy for classes also increases.

Energy Spots
There are energy spots around the castle which refresh after a certain time period. Pets are the only energy spots which allow the player to to past the maximum limit.

Official

 * Pets (Dormitory)
 * Wolf Pup (Magical Creatures Reserve)
 * Golden Snitch (Quidditch Stadium)
 * Girl with Flowers Portrait (East Towers)
 * Peeves (East Towers)
 * Fruit Bowl Portrait (West Towers)
 * Knight (Lower Floor - West)
 * Torch (Lower Floor - West)
 * House-Elf (Dungeons)
 * Stick (Castle Grounds)
 * Books (Lower Floor - East)
 * Sledding Kid (Hogsmeade)
 * Spider (Forbidden Forest)
 * Sack of Gold (Diagon Alley)
 * Tentacle of Giant Squid (Black Lake)
 * Dragon (Dragon Reserve)
 * Grave (Godric's Hollow)

Fanon
PetStarPlanet
 * Window (House)

Official
Energy can be spent on the following actions:
 * Classes
 * Look for Creature Food
 * Story tasks

Energy can be earned the following ways:
 * Waiting 4 minutes
 * Energy spots
 * As a random reward when reaching a star in a class or feeding a maxed creature
 * As a Duelling Club reward
 * Winning a duel
 * As a level up gift for friends
 * As a level up gift for creatures
 * Completing Defence Against the Dark Arts (Year 5), History of Magic and Divination classes
 * As a House Pride prize
 * Buying it with gems
 * Reaching a new XP level

The following actions increase the maximum number of energy:
 * Completing Flying classes

PetStarPlanet's ideas
Energy can be spent in the following ways:
 * Prefect Duties