1. **Introduction of the Game**
NBA LIVE Mobile Basketball is an immersive and action-packed mobile sports experience developed by Electronic Arts (EA). This mobile game offers players the chance to build and manage their dream team of NBA superstars and legends, competing in live events and matches to dominate the courts in 5-on-5 action. With its realistic NBA simulation, players can embark on a journey to achieve basketball glory on the virtual hardwood.

2. **All Characters and Levels of the Game**
The 'characters' in NBA LIVE Mobile are the actual NBA players, past and present, which users can collect to form their ultimate team. Players range in ability and rarity, with levels such as bronze, silver, gold, elite, and up to superstar. The game has a variety of levels in the form of different game modes, such as Season, which simulates a full NBA season, Live Events, which are timed challenges based on real NBA events, Head-to-Head matches, and special campaign modes reflecting current NBA happenings.

3. **What Attracts Users Most to the Game**
Users are most attracted to the authentic NBA experience NBA LIVE Mobile provides. The ability to collect favorite players, create dynamic rosters, and compete in various game modes keeps players engaged. The graphics, the smooth and intuitive touch controls, and the regular updates with new content also greatly enhance the game's appeal.

4. **Why It Is Popular**
NBA LIVE Mobile is popular due to its association with the NBA brand and because it fills the niche of a full-fledged basketball simulation on mobile devices. The game's free-to-play model with in-app purchases allows for wide accessibility while providing depth and complexity for dedicated players. Its constant refresh of content, coupled with the global popularity of basketball, contributes to its widespread appeal.

5. **When the Game was Released and How Many Versions are Currently Available**
NBA LIVE Mobile Basketball was first released in 2016. Since then, the game has not had versions in the traditional sense but operates on a seasonal update model. The game refreshes its content annually to match the new NBA season, with updates labeled as new seasons. These are not standalone versions, but rather updates to the core game.

6. **The Most Difficult Part of the Game**
One of the most difficult parts of the game for many users is managing the in-game economy and resources to build a strong team without resorting to real-money purchases. Additionally, some live events and challenges can be particularly tough, especially those that require a high-skill roster or precise mastery of the game’s controls and strategies.

7. **Strengths and Weaknesses of the Game**
Strengths of NBA LIVE Mobile include its robust licensed content, variety of modes, and frequent updates that keep the game fresh. On the downside, some users feel the game has a steep learning curve. The freemium model may also be seen as a weakness, as players who pay may have an advantage over those who do not.

8. **What Other Games Have Been Developed by the Same Developer**
EA, the developer of NBA LIVE Mobile, is known for its extensive range of sports games, including FIFA Mobile, Madden NFL Mobile, and EA SPORTS UFC Mobile. Outside of sports, EA's portfolio includes hit titles like The Sims Mobile, Star Wars: Galaxy of Heroes, and Need for Speed: No Limits, to name a few.