1. **Introduction of the game**
Hitmasters is a strategic puzzle-based shooter game that challenges players to navigate through a series of levels using problem-solving skills and timing to defeat enemies. With a mix of humor, action, and tactical gameplay, Hitmasters has captured the attention of players who enjoy a mental challenge coupled with cartoonish violence.

2. **All characters and levels of the game**
The game features various characters, each with their unique abilities and weapons. From the Shotgun Guy and the Grenade Dude to the Fireman and the Plague Doctor, players can unlock and choose characters as they progress in the game. The levels in Hitmasters are intricately designed with increasing complexity. They require the player to interact with the environment, use physics to their advantage, and strategically plan their moves to complete challenges and eliminate opponents.

3. **What attracts users most to the game**
Users are most attracted to Hitmasters due to its clever level design, the satisfaction of solving puzzles, and the comedic elements that unfold with each successful hit. The simple yet engaging mechanics, along with the quick and gratifying gameplay loops, make it a hit with players looking for a smart casual gaming experience.

4. **Why it is popular**
Hitmasters has gained popularity for its intuitive controls, engaging gameplay that mixes puzzle-solving with action, and a vast array of levels that keep the game fresh and entertaining. Its popularity is bolstered by its accessibility to players of all skill levels, offering a rewarding challenge that keeps users coming back.

5. **When the game was released and how many versions are currently available**
Hitmasters was released in early 2020. Since then, the game has undergone several updates, providing new content, characters, and levels to keep the experience novel for returning players. The exact number of versions can vary as the developers continue to release updates and additional features.

6. **The most difficult part of the game**
One of the most difficult parts of Hitmasters lies in the later levels, where players must demonstrate precision, strategic planning, and quick reflexes. Levels that feature multiple enemies with different behaviors, environmental hazards, and limited resources to complete the objectives can be particularly challenging.

7. **Strengths and weaknesses of the game**
Strengths of Hitmasters include its unique combination of puzzle-solving and action, its humorous approach, and the diversity of level designs and characters. Its weakness might be a certain level of repetition in earlier stages, potential frustration at higher difficulty levels, and a reliance on trial and error that some players might find less engaging over time.

8. **What other games have been developed by the same developer**
The developer behind Hitmasters, Playgendary Limited, has also developed several other popular mobile games, including titles like "Kick the Buddy," "Bowmasters," "Tank Stars," and "Perfect Cream." Each of these games carries a distinctive play style and aesthetic, appealing to a wide range of players with their simple, fun, and addictive gameplay.