1. Introduction of the game:
"State of Survival: Zombie War" is a strategic survival game that thrusts players into a post-apocalyptic world overrun with zombies. In this intense game developed by KingsGroup Holdings, players must build a haven, rescue survivors, and forge alliances to survive against the relentless undead and rival factions. As a blend of strategy, tower defense, and survival elements, the game tasks players with resource management, base building, and tactical combat, all while unraveling a compelling storyline.

2. All characters and levels of the game:
The game features a diverse cast of characters, each with unique abilities and backstories, such as the rugged fighter Sarge, the skilled archer Rusty, and the ingenious scientist Maddie & Frank. Players progress through various levels that increase in difficulty, with each stage posing new threats and requiring different strategic approaches. As they advance, they can unlock and upgrade these characters to bolster their defenses and improve their chances of survival.

3. What attracts users most to the game:
Users are most attracted to "State of Survival" due to its immersive gameplay that combines survival challenges with strategic planning. The social aspect of forming alliances with other players adds to the appeal, creating a communal sense of survival against the horde. Additionally, the game's regular updates, events, and in-game rewards provide an ever-evolving playing field that keeps gamers engaged.

4. Why it is popular:
"State of Survival" has garnered popularity for its well-crafted story, strategic depth, and high-quality graphics. The game also allows for a personalized experience as players can choose different approaches to building and defending their settlements. Furthermore, its competitive and cooperative multiplayer elements ensure that there is something for both solo players and team players, contributing to its broad appeal.

5. When the game was released and how many versions are currently available:
The game was released on August 29, 2019, and since then, it has undergone numerous updates to enhance its gameplay, introduce new features, and improve user experience.
6. The most difficult part of the game:
The most challenging aspect of "State of Survival" lies in its PvP (Player versus Player) combat, where players must strategically outmaneuver other human opponents to survive and thrive. Managing resources effectively while defending against both zombies and rival players requires strategic foresight and can be particularly demanding.

7. Strengths and weaknesses of the game:
Key strengths of "State of Survival" include its engaging gameplay, variety of characters and strategies, and dynamic game environment. However, it also has some weaknesses, such as the potential for pay-to-win scenarios, where players who spend money may gain significant advantages over free-to-play participants.

8. What other games have been developed by the same developer:
KingsGroup Holdings, the developer of "State of Survival," is renowned in the mobile gaming community and has developed several other popular games, including "Z Day: Hearts of Heroes" and "King of Avalon." These titles also feature strategy and management gameplay elements that have resonated with a large player base worldwide.