1. Introduction of the game:
Sonic The Hedgehog 2 Classic is a thrilling and nostalgic side-scrolling platform game that brings back the iconic Sonic and his companion Tails in their quest to defeat the evil Dr. Robotnik. Packed with high-speed action and vibrant visuals, this game captures the essence of the original Sonic games that gained immense popularity.

2. All characters and levels of the game:
In Sonic The Hedgehog 2 Classic, players can control Sonic or his trusted sidekick, Tails. Throughout the game, they encounter a host of memorable characters such as Knuckles and Amy Rose. The game is divided into multiple challenging levels, including the iconic Green Hill Zone and the chemical-infested Chemical Plant Zone.

3. What attracts users most to the game:
Sonic The Hedgehog 2 Classic's biggest draw lies in its fast-paced gameplay, allowing players to experience the thrill of Sonic's lightning-fast speed. The game also offers vibrant and immersive visuals, accompanied by a memorable soundtrack, that transport players back to the golden age of platform gaming.

4. Why it is popular:
This game became popular due to its nostalgic appeal that resonates with Sonic fans, both old and new. The combination of beloved characters, engaging levels, and intense gameplay has helped Sonic The Hedgehog 2 Classic stand the test of time and maintain its popularity over the years.

5. When the game was released and how many versions are currently available:
Sonic The Hedgehog 2 Classic was initially released on February 24, 2010, on iOS and Android platforms. Since then, it has been updated numerous times with improved graphics and additional features. Currently, there are multiple versions available for mobile devices, ensuring a wider audience can enjoy the Sonic experience.

6. The most difficult part of the game:
Many players agree that the most challenging part of Sonic The Hedgehog 2 Classic is the final boss battle against Dr. Robotnik. The relentless onslaught of more complex patterns and obstacles requires precise timing and mastery of Sonic's abilities to emerge victorious.

7. Strengths and weaknesses of the game:
One of the strengths of Sonic The Hedgehog 2 Classic is its addictive gameplay, keeping players engaged for hours on end. The game also boasts responsive controls, providing an enjoyable gaming experience. However, some may find the learning curve to be a bit steep, which can be both a strength and weakness depending on the player's preference.

8. What other games have been developed by the same developer:
Sonic The Hedgehog 2 Classic was developed by SEGA, a renowned video game developer known for creating various iconic titles. Apart from Sonic The Hedgehog 2, SEGA has developed numerous games featuring the popular blue hedgehog, including Sonic Forces, Sonic Mania, and Sonic Colors. These titles have further solidified SEGA's reputation as a leading developer in the gaming industry.