1. Introduction of the game:
Welcome to the apocalyptic world of Puzzles & Survival, a unique combination of match-3 puzzle gameplay with classic base-building and survival strategy mechanics. In this game, players are tasked with the challenge of navigating a world overrun by zombies, using their wit to match tiles for resources, build up their sanctuary, and rescue survivors to create a formidable community.

2. All characters and levels of the game:
The game features a diverse array of characters, each with their own unique skills and abilities that can be leveraged in the fight against the undead. Units range from fearless soldiers and cunning scouts to talented medics and resourceful engineers. The levels in Puzzles & Survival increase in difficulty as players advance, offering a variety of challenges that require strategic planning and quick thinking to overcome.

3. What attracts users most to the game:
Players are attracted to Puzzles & Survival by its engaging combination of genres. The satisfaction of solving match-3 puzzles coupled with the thrill of surviving in a post-apocalyptic environment keeps players engrossed. The game's social elements, such as forming alliances and competing against others, also add a compelling layer of depth that makes the experience more riveting.

4. Why it is popular:
Puzzles & Survival has gained popularity due to its innovative integration of match-3 gameplay with survival strategy elements. Players enjoy the fresh twist on familiar mechanics, the game's polished graphics, and the gratification that comes from building and managing their own sanctuary among chaos.

5. When the game was released and how many versions are currently available:
Puzzles & Survival was released in late 2020. Since its launch, the game has received multiple updates and versions, each introducing new features, characters, and events to keep the gameplay experience fresh and exciting for its audience. Please refer to the app store or official channels for the latest version information.

6. The most difficult part of the game:
Many players find the higher-level stages to be particularly challenging, where the complexity of puzzles increases, and the pressure to manage resources effectively is amplified. Additionally, competing against other players for dominance in this survival world can be quite a demanding aspect of the game.

7. Strengths and weaknesses of the game:
Puzzles & Survival's strengths lie in its unique genre combination, engaging gameplay loop, and strong community features. However, some players may find the game's in-app purchase model or the need for strategic resource management to be a weakness, potentially creating a steep challenge curve or incentivizing pay-to-win scenarios.

8. What other games have been developed by the same developer:
Puzzles & Survival is developed by 37GAMES, a developer known for their portfolio of browser and mobile games. Other popular titles by the same developer include Fury Survivor: Pixel Z, Wild Frontier, and Soul Land Reloaded, each offering different gaming experiences across various genres.