1. Introduction of the game:
Super Mario Run is an innovative mobile game that offers a new twist on the beloved Mario franchise. As an automatic runner, the game perfectly adapts the classic platforming mechanics to touchscreen devices. The player guides Mario through various worlds, with the character continuously moving forward, and conducts jumps and special moves with simple taps.

2. All characters and levels of the game:
Super Mario Run features several characters from the Mario universe including Mario, Luigi, Princess Peach, Toad, Toadette, and Yoshi, each with unique abilities. The game is divided into different modes, with the core being the "World Tour," consisting of 24 levels spread across six worlds. There are also additional modes such as "Toad Rally," a competitive mode against other players' ghost characters, and "Kingdom Builder," where players can create their own unique kingdom using coins and toads earned in-game.

3. What attracts users most to the game:
The game's simple, one-handed play style, beautifully-rendered courses, and the nostalgia of the Mario franchise are significant attractions for users. The ease of playing combined with the challenge of mastering each level and unlocking all characters holds a strong appeal.

4. Why it is popular:
Super Mario Run's popularity is anchored in its iconic brand and Nintendo's legacy. The convenience of smartphone gaming with a well-known and loved character makes it a go-to game for many. Its accessibility for all ages and skill levels, along with the satisfaction of completing challenging levels, keeps players hooked.

5. When the game was released and how many versions are currently available:
Super Mario Run was released on December 15, 2016, for iOS and later for Android devices. While there has been only one version of the game in terms of title, Nintendo has released multiple updates to add new features, levels, and characters since the game's initial launch.

6. The most difficult part of the game:
Many players find the later levels of the World Tour to be quite challenging. Also, getting all the black coins or achieving a high score in Toad Rally against seasoned players can be tough.

7. Strengths and weaknesses of the game:
Strengths of Super Mario Run include its high-quality graphics, easy-to-learn controls, and the reimagining of the traditional Mario gameplay for mobile devices. However, some of the weaknesses pointed out by players include the game's relatively high price for unlocking the full content and the requirement for a constant internet connection to play.

8. What other games have been developed by the same developer:
Super Mario Run was developed by Nintendo Co., Ltd, which is renowned for creating some of the most legendary games and series in the industry. These include Super Mario Bros., The Legend of Zelda, Pokémon, Metroid, Animal Crossing, Donkey Kong, and many more. Nintendo has also expanded into mobile gaming with other titles such as Fire Emblem Heroes, Animal Crossing: Pocket Camp, and Mario Kart Tour.