1. Introduction of the game
Evertale is a fantasy role-playing game (RPG) that immerses players in the vivid world of Erden, a land plagued by a curse known as Pandemonium. Developed by ZigZaGame Inc., this game captures the essence of classic RPGs and monster-capturing gameplay. With an engaging storyline, players embark on an epic adventure to capture, train, and evolve creatures called "Monsters" and unravel the mysteries behind the Pandemonium.

2. All characters and levels of the game
In Evertale, players meet a diverse cast of characters, each with unique backgrounds and motives. Central to the story are the protagonists, along with a plethora of monsters that can be captured. With varying rarities and abilities, these creatures form the heart of a player's team. The game features distinct levels, spanning different landscapes of Erden, from bustling cities to desolate ruins, each presenting its own set of challenges and story segments.

3. What attracts users most to the game
Players are often attracted to Evertale for its stunning artwork and creature designs, as well as its strategic turn-based combat system that rewards team synergy and tactical planning. The expansive world and deep lore provide an immersive experience, while the collecting and evolving mechanics offer a sense of progression and discovery that keeps players engaged.

4. Why it is popular
Evertale has gained popularity through its combination of a compelling storyline, intricate world-building, and classic RPG elements blended with monster-catching excitement. The social features, including online PvP and guilds, also contribute to its popularity by enabling players to connect and compete with others around the globe.

5. When the game was released and how many versions are currently available
Evertale was released on March 21, 2019. Since its initial launch, the game has undergone several updates to improve gameplay experience, add new content, and balance existing features. However, the game itself is still considered to have one core version, with no sequels or distinct separate versions.

6. The most difficult part of the game
Players often find the post-game content to be particularly challenging, with high-level zones and competitive PvP battles that require a deep understanding of game mechanics and optimized teams. The limited-time events may also pose a level of difficulty due to their unique restrictions and powerful bosses.

7. Strengths and weaknesses of the game
Among Evertale's strengths are its immersive storyline, detailed world, and appealing character and monster artwork. Nevertheless, the game's weaknesses include a reliance on in-app purchases for the fastest progression, which can lead to a pay-to-win scenario for competitive aspects. Additionally, some players may find the grinding required for leveling and evolving monsters to be tedious.

8. What other games have been developed by the same developer
ZigZaGame Inc. is known for developing other mobile games alongside Evertale. Some of their titles include Neo Monsters, another monster-catching RPG, and various other mobile games that explore different genres and themes, though Evertale remains one of their most notable and successful creations.