**1. Introduction of the game**
"Harry Potter: Hogwarts Mystery" is an enchanting adventure mobile game that allows players to experience the magic of the Wizarding World. Developed by Jam City, Inc., this role-playing game invites users to embark on a personalized journey through the hallowed halls of Hogwarts School of Witchcraft and Wizardry. With immersive narratives and interactive storytelling, players have the unique opportunity to live out their own Harry Potter saga, attend classes, learn spells, build friendships, and make pivotal decisions that influence their character's story arc.
**2. All characters and levels of the game**
The game features a myriad of characters from the beloved Harry Potter series, including Professors McGonagall, Snape, and Dumbledore, as well as original characters like Penny Haywood, Merula Snyde, and your custom protagonist. Players progress through the game by advancing years, each encapsulating several levels, which reflect their academic advancement at Hogwarts. As your character progresses from Year 1 to the final year, new locations, challenges, and storylines unfold.

**3. What attracts users most to the game**
The game's intricate customization options for characters, the ability to forge one's path through crucial decision points, and the immersive interaction with both canonical and new characters are what garners the attention of its audience. Players are attracted to the depth of the world-building, the opportunity to explore familiar settings like the Great Hall and Forbidden Forest, and the sense of camaraderie through friendships or rivalries that develop throughout the game.

**4. Why it is popular**
"Harry Potter: Hogwarts Mystery" leverages the global popularity of the Harry Potter franchise, captivating those who've always dreamt of receiving their own Hogwarts letter. Its popularity stems from the game's faithfulness to the source material, combined with the freedom to weave one's narrative within this universe. The game's accessibility and regular content updates keep the community engaged and consistently draw in new players.

**5. The most difficult part of the game**
Many players find the game's energy system and associated wait times to be a challenging aspect, as it can interrupt immersion and limit gameplay. Certain story tasks and duel challenges require strategy and patience, and might take multiple attempts to master.

**6. Strengths and weaknesses of the game**
Strengths of "Harry Potter: Hogwarts Mystery" include its engaging story, extensive character interaction, and the authentic feel of the Wizarding World. However, its weaknesses lie in the frequent microtransactions and energy refill system that may hamper the overall experience. The game can be considered to have a slow pace, making it less appealing to those who prefer fast-paced action.

**7. What other games have been developed by the same developer**
Jam City, Inc., the developer of "Harry Potter: Hogwarts Mystery," has created other popular games including "Cookie Jam", "Panda Pop", "Disney Emoji Blitz", and "Family Guy: The Quest for Stuff". Their portfolio showcases expertise in creating games that are rich in narrative and filled with engaging content.