1. Introduction of the game:
Trivia Crack is an addictive and engaging mobile game that challenges players' knowledge in various categories. It offers a unique trivia experience where players can compete against friends, family, and players from around the world.

2. All characters and levels of the game:
The game features six charming and lively characters, each representing a different category: Art, Science, Sports, Entertainment, Geography, and History. Players progress through different levels within these categories, starting from easy questions and gradually unlocking more challenging ones as they advance.

3. What attracts users most to the game:
One of the main attractions of Trivia Crack is its social aspect. Players can challenge their friends or random opponents, engaging in friendly competitions and proving their knowledge superiority. The game also offers various power-ups and special bonuses that add excitement and strategy to the gameplay, making it highly addictive for users.

4. Why it is popular:
Trivia Crack has gained immense popularity due to its unique blend of trivia challenges and social interaction. The gameplay is not only educational but also entertaining, allowing players to learn and have fun simultaneously. The competitive nature of the game, paired with its vibrant graphics and intuitive user interface, keeps players hooked for hours.

5. When the game was released and how many versions are currently available:
The game was initially released by Etermax on October 26, 2013, for iOS and Android platforms. Since its launch, Trivia Crack has evolved, and currently, multiple versions are available, including Trivia Crack 2 and Trivia Crack Kingdoms, each offering new features and gameplay variations.

6. The most difficult part of the game:
The most challenging aspect of Trivia Crack is the variety and depth of questions across different categories. As players progress to higher levels, the questions become progressively more difficult, testing their knowledge to the limit. The game demands a broad range of expertise and the ability to think quickly under pressure.

7. Strengths and weaknesses of the game:
One of the key strengths of Trivia Crack is its extensive collection of questions, ensuring endless entertainment and learning opportunities. The social component of challenging friends and global opponents adds a competitive edge. However, some users may find the occasional repetition of questions or the need for in-app purchases to be limitations of the game.

8. What other games have been developed by the same developer:
Etermax, the developer of Trivia Crack, has created several other successful games. These include Aworded Crack, a popular word game, and Pictionary-based game apps such as Draw Something Classic and Draw Something 2, which have further showcased the developer's innovation and creativity in the gaming industry.