**Introduction to AFK Arena**
AFK Arena is a captivating mobile role-playing game developed by Lilith Games, which invites players into the enchanting world of Esperia, a land rich with lore, mystical heroes, and a unique art style that sets it apart from the typical RPG. The game offers a strategic battle experience where players can collect and upgrade a variety of heroes from different factions, each possessing unique abilities and backstories.

**All Characters and Levels of the Game**

The game boasts an extensive roster of characters, known as heroes, categorized into factions such as Lightbearers, Maulers, Wilders, Graveborn, Celestials, Hypogeans, and Dimensionals. Each hero can be leveled up and ascended, unlocking new skills and increased power. The game's progression is marked by chapters, with each level offering increasing challenges as players strategically assemble their team to combat the AI-controlled enemies.

**What Attracts Users Most to the Game**

Players are most enticed by the AFK Arena's passive progression system, which allows for collecting resources even while they are away from the game, living up to the "AFK" (Away From Keyboard) aspect. This, combined with the intricate hero customization, the depth of strategic gameplay, and the frequent in-game events with rewards, keeps the players engaged and continually coming back for more.

**Why It Is Popular**

AFK Arena's popularity stems from its user-friendly gameplay design that respects players' time, its striking art style, and its compelling narrative. The game is accessible for casual play, yet it offers deep strategic layers for more hardcore gamers. Its continuous updates with new content and heroes maintain a fresh experience for the player base.

**Release Date and Versions**

AFK Arena was released in April 2019 and since then, it has seen numerous updates and patches. These updates have not only introduced new heroes but also various game modes, features, and seasonal events. There have been multiple versions of the game, with each major update typically being referred to by its version number, such as 1.60, 1.61, and so on.

**The Most Difficult Part of the Game**

Among the challenging aspects of AFK Arena, players often cite the campaign levels that become increasingly difficult as a significant challenge, requiring well-thought-out team compositions and strategies. Additionally, the PVP aspect, known as the Arena of Heroes, can be particularly tough as players are up against other skilled and strategically crafted teams.

**Strengths and Weaknesses of the Game**

AFK Arena's strengths lie in its beautiful artwork, compelling storytelling, and the convenience of passive gameplay. The regular updates and in-game events cater to a lively gaming experience. However, its weaknesses may include the late-game grind that could potentially become tedious for some players and the gacha system that may require patience or investment to obtain specific heroes.

**Other Games by the Same Developer**

Lilith Games, the developer behind AFK Arena, has created other notable games, including "Rise of Kingdoms," a large-scale strategy game, "Art of Conquest," which is well-known for its mix of RTS and RPG elements, and "Soul Hunters," another adventure-filled RPG with strategic combat. These games have also achieved significant popularity and contain elements of strategy and character collection, similar to AFK Arena.