1. Introduction of the game:
Candy Crush Soda Saga is a tantalizingly sweet match-3 puzzle game from the makers of the legendary Candy Crush Saga. This effervescent adventure invites players to match candies and pop soda bottles to unleash the power of purple soda, clear levels, and move through a whimsical world. With vibrant graphics, dynamic gameplay, and an ever-expanding universe of levels and challenges, Candy Crush Soda Saga offers a fresh twist on the familiar candy-matching genre.

2. All characters and levels of the game:
The game features a delightful cast of characters, including Kimmy on her journey to find Tiffi, with each character playing a unique role in guiding players through the sugary saga. Levels are distinguished by goal-oriented tasks, ranging from freeing gummy bears trapped under ice to collecting a specific number of bottle caps. With thousands of levels available and new ones regularly added, players are consistently treated to a myriad of candy-coated challenges that keep the game fresh and engaging.

3. What attracts users most to the game:
Users are most attracted to Candy Crush Soda Saga by its addictive gameplay, eye-catching candy graphics, and the satisfying cascade of matches and combos. The social elements, such as leaderboards and Facebook connectivity, encourage friendly competition and sharing achievements. Additionally, the frequent updates and special events provide ongoing entertainment that hooks both casual players and die-hard fans.

4. Why it is popular:
Candy Crush Soda Saga's popularity can be credited to its simple yet strategic gameplay that is easy to learn but difficult to master. The game offers a fine balance of relaxation and challenge, appealing to a wide audience seeking entertainment in their downtime. Its cross-platform availability also allows players to synchronize their progress across multiple devices, ensuring a seamless play experience.

5. When the game was released and how many versions are currently available:
Candy Crush Soda Saga was first released on October 20, 2014. Since its inception, the game has evolved with frequent updates that introduce new features, levels, and in-game events. While there's primarily one core version of the game, its iterations across various platforms such as iOS, Android, and Facebook keep it accessible and popular among different users.

6. The most difficult part of the game:
The most challenging aspect of the game often lies in the higher levels, where players face complex boards, limited moves, and difficult-to-reach objectives. Certain levels require meticulous strategy and sometimes a touch of luck to navigate the myriad of obstacles and achieve the goals.

7. Strengths and weaknesses of the game:
Candy Crush Soda Saga's strengths include its engaging match-3 mechanics, colorful graphics, and a diverse range of levels that cater to different play styles. Its casual pace allows for pick-up-and-play accessibility. However, one of its weaknesses could be the reliance on in-app purchases for additional lives and power-ups, which might deter players looking for a completely free-to-play experience. Some may also find the difficulty of certain levels frustrating without resorting to extra help from items.

8. What other games have been developed by the same developer:
King, the developer behind Candy Crush Soda Saga, has also created a variety of other popular titles including the original Candy Crush Saga, Candy Crush Jelly Saga, Candy Crush Friends Saga, Farm Heroes Saga, Bubble Witch Saga series, and Pet Rescue Saga, among others. Each of these games offers a unique twist on the match-3 formula and retains the colorful and addictive gameplay that King is known for.