Harry Potter: Hogwarts Mystery is an exciting mobile game that takes you through a fictional journey at Hogwarts School of Witchcraft and Wizardry. Here is a guide on how to play the game:

1. Choose your character: The game allows you to create your character, selecting aspects such as hair color, skin tone, facial features, and clothing. This character will be with you throughout the adventure, attending classes, completing quests, and making friends.

2. Attend classes: As a student in Hogwarts, classes play a significant role in the game. As a first-year student, you'll attend basic classes like Potions, Defense Against the Dark Arts, and Charms. As you progress through the years, new classes become available, providing new challenges and leveling up on skills.

3. Explore the Hogwarts grounds: The Hogwarts castle is an open-world filled with familiar places found in the Harry Potter series. You can explore and interact with different areas such as classrooms, common rooms, and the Forbidden Forest. 

4. Complete Quests: The game's main story is broken into chapters, and there are various quests that help you uncover the main storyline. These quests involve engaging with magical creatures, dueling, and solving puzzles. 

5. Build Relationships: In Hogwarts, relationships play a significant role in the game. You can interact with other characters, make allies, and advance your character's story with their help. 

6. Customize your avatar: As you progress through the game, you unlock new robes, hairstyles, and other customizations to make your character unique.

7. Manage Energy: Each class, quest, and activity requires energy. Energy is consumed on tasks that help you gain experience points, be it taking a quiz or researching spells. Once you run out of energy, you'll have to wait or pay to recharge. Using energy wisely will help you progress efficiently through the game.

8. Earn House Points: As in the series, the four Hogwarts houses - Gryffindor, Hufflepuff, Ravenclaw, and Slytherin - are central to the game. You'll earn points for your house as you complete quests, attend classes, and play the game. 

9. Participate in events: The game developers regularly introduce various events such as dueling events, holidays and house competitions that offer rewards and exclusive outfits for players. Participating in these events are crucial for those aiming for 100% completion of the game. 

10. Manage your inventory: As you progress through the game, you collect different items, such as potions, spells, and currencies. Managing the inventory is essential as each item has a specific purpose and utilizing them correctly can aid one in progressing faster.

Overall, Harry Potter: Hogwarts Mystery is an interactive game that offers a unique experience that every Harry Potter fan can enjoy. Its mix of storytelling, quests and familiar characters, allows the player to feel truly immersed in the magical world of the books and movies. Follow the guidelines above, and you'll be on your way to discovering the secrets of Hogwarts.