1. Introduction of the game:
Welcome to the world of Angry Birds 2 - the highly addictive and action-packed mobile game that revolutionized the casual gaming industry. Developed by Rovio Entertainment, this sequel to the original Angry Birds game takes the franchise to new heights with improved graphics, challenging gameplay, and exciting features.

2. All characters and levels of the game:
Angry Birds 2 showcases an extensive range of beloved characters from the original game, such as the iconic Red, speedy Chuck, explosive Bomb, and the mighty Terence. Each character possesses unique abilities that players can strategically deploy to overcome the numerous levels and challenges awaiting them.

The game features an impressive assortment of levels, each with its own distinct obstacles and structures. From the frosty terrain of Winter Wonderland to the fiery depths of Piggy Tower, players will embark on a thrilling journey across imaginative and visually stunning environments.

3. What attracts users most to the game:
One of the primary attractions of Angry Birds 2 is its intuitive and immersive gameplay experience. Players can effortlessly launch birds at the mischievous green pigs by adjusting the angle and power of their slingshot. The combination of accessible mechanics, coupled with an engaging physics-based puzzle design, allows users of all ages to enjoy the game.

Moreover, the game caters to a competitive spirit as players can participate in daily challenges, multiplayer battles, and global leaderboards. This social element adds a layer of excitement and fosters a sense of community among players.

4. Why it is popular:
Angry Birds 2 has gained immense popularity due to its blend of approachable gameplay and captivating visuals. The game successfully combines elements of strategy, skill, and luck, offering a dynamic and rewarding experience. Furthermore, regular updates and additions to the game keep it fresh and continuously entice players to come back for more addictive avian action.

5. When the game was released and how many versions are currently available:
The Angry Birds 2 game was initially released on July 30, 2015. Since then, it has seen significant updates and iterations, leading to the availability of multiple versions across various platforms, including iOS and Android.

6. The most difficult part of the game:
The most daunting challenge in Angry Birds 2 lies in devising effective strategies to navigate complex levels and defeat resilient pig defenses. As the game progresses, players encounter intricate structures and ingenious pig placements that demand well-timed shots and inventive tactics, making it progressively challenging.

7. Strengths and weaknesses of the game:
One of the notable strengths of Angry Birds 2 is its visually appealing graphics, bringing vibrant characters and imaginative environments to life. Additionally, the game's social features, such as multiplayer battles and leaderboards, foster healthy competition among players. However, some players may find the occasional reliance on in-app purchases for additional power-ups or extra lives as a potential weakness.

8. What other games have been developed by the same developer:
Rovio Entertainment, the developer of Angry Birds 2, has contributed to numerous other popular games. Some notable titles from their portfolio include Angry Birds Classic, Angry Birds Rio, Angry Birds Star Wars, and Angry Birds Transformers, among others. These games exhibit the same high-quality gameplay and creativity that have made Rovio a prominent figure in the mobile gaming industry.