1. Introduction of the game:
Angry Birds is an incredibly addictive and widely popular mobile game that took the gaming world by storm. In this physics-based puzzle game, players are tasked with assisting a flock of furious birds in their quest to reclaim their stolen eggs. With an array of unique abilities, players launch these angry birds from a slingshot to demolish structures and defeat the greedy green pigs who are responsible for the heinous act.

2. All characters and levels of the game:
Angry Birds features a diverse cast of characters, each possessing their own distinctive abilities and personalities. The primary heroes are Red, Chuck, Bomb, Matilda, Terence, and the Blues, who players will come to know and love throughout their gameplay. As players progress through the game, they encounter a variety of challenging levels set in different environments such as forests, beaches, deserts, and even space.

3. What attracts users most to the game:
One of the main attracting features of Angry Birds is its simple yet addictive gameplay. Players can quickly learn the mechanics and controls, making it accessible to both casual and dedicated gamers. Additionally, the game's vibrant graphics, catchy sound effects, and humorous animations contribute to its charm and appeal. The satisfying feeling of strategically launching birds and watching structures collapse captivates users and keeps them coming back for more.

4. Why it is popular:
Angry Birds gained immense popularity due to its innovative gameplay concept, addictive nature, and widespread availability across various platforms. Its charming characters and vibrant visuals resonate with players of all ages. The game's continuous updates, introduction of new levels, and integration of social elements further enhanced its popularity, turning it into a household name among mobile gaming enthusiasts worldwide.

5. When the game was released and how many versions are currently available:
Angry Birds was initially released for iOS devices in December 2009, followed by versions for Android, Windows, and other platforms. Since then, the game has seen numerous versions and spin-offs, including Angry Birds Seasons, Angry Birds Rio, and Angry Birds Space. As of now, there are over 30 different iterations available, catering to various preferences and offering fresh gameplay experiences.

6. The most difficult part of the game:
The most challenging aspect of Angry Birds lies in strategically planning and executing the perfect trajectory for each bird launch. As players progress, levels become increasingly intricate, demanding precise timing and utilization of each bird's unique abilities. Overcoming obstacles such as sturdy structures and cunning pig placements requires both strategic thinking and a bit of trial-and-error.

7. Strengths and weaknesses of the game:
One of the major strengths of Angry Birds is its ability to provide hours of entertainment through its progressively challenging levels and addictive gameplay. Its simple controls, appealing visuals, and frequent updates keep players engaged. However, some players may find the repetitive nature of launching birds and destroying structures monotonous over time. Additionally, the game heavily relies on in-app purchases, which may be seen as a weakness by those looking for a completely free gaming experience.

8. What other games have been developed by the same developer:
Rovio Entertainment, the developer behind Angry Birds, has expanded its portfolio by creating several other successful titles. Notable games include Angry Birds 2, Bad Piggies, Angry Birds Friends, and Battle Bay. These games showcase Rovio's creativity and dedication to delivering enjoyable experiences to a broad range of players.