1. Introduction of the game:
Angry Birds Friends is an addictive and action-packed mobile game that brings the iconic Angry Birds characters to life in a competitive and social environment. Players can engage in thrilling challenges, aiming to destroy the mischievous pigs' fortresses using unique bird abilities and strategic thinking.

2. All characters and levels of the game:
In Angry Birds Friends, players can play as various colorful birds, including the powerful Red, the explosive Bomb, the speedy Chuck, the boomerang expert Silver, and many more. Each character possesses distinct abilities, enabling players to devise creative strategies to overcome the challenging levels.

The game offers a wide range of captivating levels, which are constantly updated to keep the gameplay fresh and exciting. From complex constructions to tricky obstacles, players will encounter a diverse array of challenges that require both skill and precision to conquer.

3. What attracts users most to the game:
One of the key attractions of Angry Birds Friends is its social aspect. Players can compete with their friends and other players from around the world in weekly tournaments. This fosters a sense of camaraderie and healthy competition, as users strive to top the leaderboards and emerge victorious. Additionally, the game incorporates global leaderboards, encouraging players to showcase their skills on an international level.

4. Why it is popular:
The popularity of Angry Birds Friends can be attributed to its addicting gameplay, charming characters, and the continuous engagement it offers. The competitive nature of the game adds an extra layer of excitement, making it highly engaging for players seeking a challenge. The regular updates, rewards, and tournaments also contribute to its enduring popularity.

5. When the game was released and how many versions are currently available:
Angry Birds Friends was initially released in May 2012, and it has since undergone numerous updates and enhancements. As of now, there are multiple versions of the game available on various platforms, including iOS, Android, and Facebook.

6. The most difficult part of the game:
One of the most challenging aspects of Angry Birds Friends is mastering the art of trajectory and timing. Each level presents unique obstacles and configurations that require precision and strategic thinking to successfully complete. Players must carefully analyze each situation, calculating the perfect angle and power to overcome the hurdles and strike down the pigs.

7. Strengths and weaknesses of the game:
One of the strengths of Angry Birds Friends lies in its addictive gameplay, which keeps players coming back for more. The social integration and competitive features also add to its appeal, as players can connect with friends and compete worldwide. However, some may find the difficulty level to be overly challenging in later stages, potentially leading to frustration.

8. Other games developed by the same developer:
The developer of Angry Birds Friends, Rovio Entertainment, is famous for creating the immensely popular Angry Birds franchise. The series includes various spin-offs and editions such as Angry Birds Classic, Angry Birds Rio, Angry Birds Space, Angry Birds Star Wars, and many more. Rovio Entertainment has showcased its expertise in creating entertaining and innovative mobile games that captivate audiences globally.