1. **Introduction of the game**
Guardians of Cloudia is a captivating mobile MMORPG set in a vibrant and expansive fantasy world where players embark on an adventurous journey filled with magic, mystery, and thrilling combat. With a unique blend of role-playing elements, interactive social features, and an array of PvE and PvP modes, the game invites players to explore the skies of Cloudia as they seek to unlock the secrets of this celestial realm and become the ultimate guardian.

2. **All characters and levels of the game**
Guardians of Cloudia features a diverse selection of characters, known as classes, each with their distinct playstyle and abilities. These classes include the enigmatic Archer, the mystical Mage, the stoic Sword Master, the benevolent Oracle, and the stealthy Rogue. As players progress, they'll traverse through numerous levels that increase in complexity and challenge, with each zone offering new quests, enemies, and dungeons to conquer. Players can hone their skills, level up their characters, and strategize with a variety of skill combinations to tackle these challenges.

3. **What attracts users most to the game**
The game's rich 3D graphics and immersive storyline deeply captivate players, while the social interaction component, including guilds, team-ups, and marriages within the game, enhances the user experience. Additionally, players are drawn to the customization options for characters and pets, as well as the exciting aerial combat and versatile skill sets that promise a unique experience for every individual.

4. **Why it is popular**
Guardians of Cloudia enjoys its popularity due to its engaging and comprehensive content, combining a mix of role-playing, strategy, and social elements. Its popularity is further bolstered by regular updates and events that keep the gameplay fresh and exciting for new and veteran players alike.

5. **When the game was released and how many versions are currently available**
Guardians of Cloudia was released on [Release Date], and as of [Knowledge Cutoff Date], there are several versions available. These versions may include updates and expansions that have been released over time to enhance the gameplay and introduce new features to the player base.

6. **The most difficult part of the game**
The most difficult part of Guardians of Cloudia often involves high-level dungeons and world bosses, where players must utilize strategic teamwork and have a thorough understanding of their character's playstyle to succeed. The endgame content, particularly where players compete against each other in PvP arenas, also presents significant challenges that require both skill and coordination.

7. **Strengths and weaknesses of the game**
Strengths of Guardians of Cloudia include its extensive world design, the variety of classes and customization options, and the engaging social aspects. However, weaknesses may be seen in the potential for pay-to-win elements, as is common with many free-to-play mobile games, and some players may find certain aspects of the game to be repetitive over time.

8. **What other games have been developed by the same developer**
The developer of Guardians of Cloudia has also created other notable games. However, to provide accurate information about other games developed by the same team, I would need to know the specific developer or game studio responsible for creating Guardians of Cloudia. If you can provide this information, I can then give you a list of their other games.