1. Introduction of the game:
Sonic CD Classic is an iconic platform game that brings back the thrilling adventures of the beloved blue hedgehog, Sonic. With its fast-paced gameplay, engrossing storyline, and vibrant visuals, this game takes players on an exhilarating journey through time and space.

2. All characters and levels of the game:
In Sonic CD Classic, players get to control Sonic himself as he races through various levels filled with exciting challenges and enemies. Alongside Sonic, players encounter his faithful companion, Tails, and the villainous Dr. Robotnik, also known as Eggman. Each level, ranging from the lush Green Hill Zone to the futuristic Stardust Speedway, presents unique obstacles and secrets to uncover.

3. What attracts users most to the game:
One of the main attractions of Sonic CD Classic is the timeless charm of the Sonic franchise. The game offers a nostalgic experience for long-time fans while also captivating new players with its engaging gameplay. The fast-paced action, breathtaking visuals, and catchy music combine to create an immersive and addictive gaming experience.

4. Why it is popular:
Sonic CD Classic has gained popularity due to its innovative gameplay mechanics and the ability to travel through time. The game introduced the time travel feature, allowing players to explore levels in both the past and future, bringing a fresh dynamic to the Sonic series. Additionally, the game's intricate level design, compelling storyline, and memorable characters have contributed to its enduring popularity.

5. When the game was released and how many versions are currently available:
Sonic CD Classic was originally released in 1993 for the Sega CD console. Since then, it has been re-released on various platforms, including iOS, Android, and PC. As of now, multiple versions of the game are available, tailored to suit different devices and operating systems.

6. The most difficult part of the game:
One of the most challenging aspects of Sonic CD Classic is mastering the time travel feature. Successfully navigating through the past and future versions of each level requires precise timing and careful exploration. This adds an extra layer of complexity to the gameplay, making it a rewarding experience for dedicated players seeking a challenge.

7. Strengths and weaknesses of the game:
One of the strengths of Sonic CD Classic is its visually stunning graphics, which bring the vibrant worlds to life. The game also boasts a captivating storyline, further immersing players in Sonic's adventures. However, some players may find the controls slightly challenging, especially during high-speed sections. Additionally, the difficulty level of certain levels can be quite steep, which may pose a challenge for casual gamers.

8. Other games developed by the same developer:
Sonic CD Classic was developed by SEGA, a renowned game developer responsible for numerous iconic games in the Sonic franchise. Some notable titles developed by SEGA include Sonic the Hedgehog, Sonic the Hedgehog 2, Sonic 3 & Knuckles, and many others, all of which have contributed to the popularity and success of the Sonic series.