1. Introduction of the game:
"Game of Thrones: Conquest" is a thrilling mobile strategy game that invites players to dive into the chaotic and noble world of Westeros. Developed by Warner Bros. Interactive Entertainment, the game is an adaptation of the HBO series based on George R.R. Martin's "A Song of Ice and Fire" novels. Players are tasked with building their own Houses, raising armies, and navigating the treacherous political landscape to claim the Iron Throne and rule the Seven Kingdoms.

2. All characters and levels of the game:
The game features a plethora of characters from the "Game of Thrones" universe, with players able to encounter iconic figures such as Jon Snow, Daenerys Targaryen, Tyrion Lannister, and many others. As for the levels, the game doesn't follow a traditional leveling system but instead focuses on expanding the player's kingdom, growing their military strength, enhancing their fortifications, and increasing their influence across a dynamically evolving map.

3. What attracts users most to the game:
"Game of Thrones: Conquest" draws players in with its complex strategy gameplay, immersive world-building, and the allure of the Game of Thrones lore. The opportunity to forge alliances or engage in warfare with other players creates a highly engaging, competitive atmosphere that mirrors the unpredictable nature of the series.

4. Why it is popular:
The game's popularity can be attributed to its connection to the critically acclaimed "Game of Thrones" series, its strategic depth, and the social component of forming alliances. The frequent updates and events based on the show keep the content fresh and continue to draw in both fans of the series and strategy gaming enthusiasts.

5. When the game was released and how many versions are currently available:
"Game of Thrones: Conquest" was released on October 19, 2017. The game undergoes continuous updates rather than discrete versions, ensuring new content and features are regularly added to keep the game evolving and engaging.

6. The most difficult part of the game:
The most difficult aspect of the game often lies in the player-vs-player (PvP) interactions. Successfully defending one's kingdom from more experienced or higher-level players, as well as navigating the complex alliances and rivalries, can present significant challenges and requires strategic cunning.

7. Strengths and weaknesses of the game:
Strengths of the game include its rich lore, depth of strategy, and the high level of social interaction. The game's weaknesses might be perceived in the need for significant time investment to progress without in-app purchases, and the potential for pay-to-win dynamics which could deter some players.

8. What other games have been developed by the same developer:
Warner Bros. Interactive Entertainment, the publisher behind "Game of Thrones: Conquest," has been involved in the development of several other successful games, including titles within the "Batman: Arkham" series, "Middle-earth: Shadow of Mordor" and its sequel "Middle-earth: Shadow of War," as well as various other games within the DC Universe and the LEGO video game franchises.