Welcome to the delightful and challenging world of Trivia Crack, a game that has captured the minds and competitive spirits of trivia enthusiasts worldwide. Since its release, Trivia Crack has established itself as a top contender in the realm of mobile quiz games, engaging players with its unique blend of knowledge and fun.

**1. Introduction of the game**
Trivia Crack is a mobile quiz game that allows players to challenge friends and other users from around the world in a battle of wits. The aim is to answer questions correctly across various categories to win characters that each represents a field of knowledge. The game is renowned for its combination of colorful graphics, social competition, and a vast array of questions that keep even the most seasoned trivia buffs on their toes.

**2. All characters and levels of the game**
The game features six characters, each symbolizing one of the following categories: Art, Science, Sports, Entertainment, Geography, and History. As players progress, they spin the colorful wheel – the "Trivia Roulette" – to randomly select the next question's category. The levels of the game are based on the number of correct answers required to win characters and ultimately defeat opponents.

**3. What attracts users most to the game**
What truly entices users is Trivia Crack’s blend of learning and entertainment, social interaction, and the thrill of competition. The ability to compete against friends, chat with other players, and climb global leaderboards adds a personal and compelling social dimension. Additionally, regular updates with new questions and the option to submit your own questions help maintain a fresh and dynamic experience.

**4. Why it is popular**
The popularity of Trivia Crack can be attributed to its accessibility, straightforward gameplay, and the universal appeal of testing one's knowledge. Its integration with social media platforms makes it easy to play with friends or connect with other trivia lovers, cultivating a competitive and engaging community. The casual gaming format fits perfectly into the busy modern lifestyle, allowing players to enjoy the game anytime, anywhere.

**5. When the game was released and how many versions are currently available**
Trivia Crack was initially released in 2013, with several versions having been developed since then. The original version has been complemented by Trivia Crack 2, along with special editions and spin-offs such as Trivia Crack Adventure, which continue to add depth and variety to the franchise.

**6. The most difficult part of the game**
The most challenging aspect of Trivia Crack is the vast range of trivia questions one must master to consistently win characters and matches. Some questions are deceptively simple, while others require in-depth knowledge, making the difficulty level unpredictable and the competition fierce.

**7. Strengths and weaknesses of the game**
Like any widely embraced game, Trivia Crack has strengths, such as its broad appeal across age groups and cultures, ease of play, and a vast repository of questions that are regularly updated. On the flip side, the game can occasionally face issues with question repetition and the balance between free and premium content, which some players find affects the overall gaming experience.

**8. What other games have been developed by the same developer**
Trivia Crack was created by Etermax, an Argentinian company specializing in social and educational games. Alongside Trivia Crack, Etermax is also known for developing popular titles such as Word Crack, Trivia Cars, and the Pictionary-esque game, Draw Something.

Each of these elements contributes to making Trivia Crack a beloved trivia game that continues to captivate the curiosity and competitive spirit of players around the globe. Whether you're a trivia novice or an aficionado, there's always something new to learn and conquer in Trivia Crack.