1. Introduction of the game:
Angry Birds Rio is an exciting and addictive puzzle game that combines the classic Angry Birds gameplay with a captivating storyline. In this installment of the globally popular Angry Birds franchise, your objective is to rescue a group of kidnapped exotic birds from their captors.

2. All characters and levels of the game:
The game features a range of beloved characters from the original Angry Birds, including Red, Chuck, Bomb, and the Blues. Additionally, players will encounter new characters like Blu and Jewel, the main protagonists of the animated film Rio. With over 320 challenging levels across different episodes and locations, players will journey through vibrant jungles, bustling cities, and treacherous mines.

3. What attracts users most to the game:
One of the biggest attractions of Angry Birds Rio is its immersive gameplay experience, which combines physics-based puzzles with strategic planning. Players must utilize each bird's unique abilities to overcome various obstacles and defeat the evil Nigel and his gang of marmosets. The game also offers hidden bonus levels and collectible items, adding an element of exploration and surprise.

4. Why it is popular:
Angry Birds Rio's popularity stems from its engaging gameplay, charming characters, and the incorporation of the beloved Rio movie universe. The game's vibrant visuals, catchy soundtrack, and humorous animations make it a hit among players of all ages. Furthermore, regular updates and new levels introduced by the developers keep the game fresh and enjoyable for long-term players.

5. When the game was released and how many versions are currently available:
Angry Birds Rio was first released on March 22, 2011, for various platforms, including iOS, Android, and Windows. Since its initial launch, the game has seen several versions and updates, expanding its content and improving the overall gaming experience.

6. The most difficult part of the game:
The most challenging aspect of Angry Birds Rio lies in mastering the precise timing and strategizing required to complete certain levels. Particularly as the game progresses, players must carefully plan their bird launches and consider the environment's physics, making it progressively more difficult to achieve three stars in every level.

7. Strengths and weaknesses of the game:
One of the key strengths of Angry Birds Rio is its intuitive gameplay mechanics that are easy to pick up and play, making it accessible to casual gamers. The game's strong visual design and immersive sound effects also contribute to its appeal. However, some may find the game's difficulty ramp-up to be a weakness, as it can become quite challenging and require careful patience and precision.

8. What other games have been developed by the same developer:
The developer of Angry Birds Rio, Rovio Entertainment Corporation, has created numerous other games in the Angry Birds franchise. Some notable titles include Angry Birds Classic, Angry Birds Seasons, Angry Birds Space, and Angry Birds Star Wars. These games have garnered immense popularity and have been successful in establishing Angry Birds as one of the most iconic and recognized gaming franchises globally.