**Introduction to Guardian Tales**
Guardian Tales is an engaging action-adventure RPG that whimsically captures the essence of classic gaming with a modern twist. Players dive into a richly crafted world filled with puzzles, dungeons, and an intriguing storyline. Developed with a blend of nostalgia and contemporary gaming mechanics, Guardian Tales offers both old-school fans and newcomers an exciting and memorable journey.

**All Characters and Levels of the Game**

The game boasts a diverse roster of characters, each with unique abilities and customization options. Heroes range from valiant knights to arcane wizards, allowing for a wide array of combat strategies and team compositions. The levels, known as stages in Guardian Tales, present a tiered difficulty structure, with each chapter unveiling a new portion of the narrative. Players advance through increasingly challenging puzzles and battle formidable bosses to progress.

**What Attracts Users Most to the Game**

Users are most attracted to Guardian Tales for its quirky and charming pixel art graphics that pay homage to classic games. The engaging storyline, humorous dialogue, and the deep, strategic combat system also contribute to its appeal. Moreover, the game's community features, such as guilds and PvP battles, create a sense of camaraderie and friendly competition that is highly engaging.

**Why It Is Popular**

Guardian Tales has garnered popularity due to its successful blend of various gameplay elements, including challenging puzzles, fast-paced combat, and an engaging story. Its nostalgic art style, combined with modern gameplay mechanisms and regular updates, keep the game fresh and exciting, which resonates well with a broad audience of players.

**Release Date and Available Versions**

Guardian Tales was released globally in 2020. Since its launch, the game has been regularly updated with new content, events, and quality-of-life improvements. The precise number of versions may vary, as it continuously evolves, but players can always download the latest version from their respective app stores, which contains all current features and updates.

**The Most Difficult Part of the Game**

One of the most difficult aspects of Guardian Tales is the endgame content, including high-level dungeons and raids. These require strategic planning, high-level heroes, well-crafted equipment, and a deep understanding of game mechanics. Additionally, the PvP arena poses a challenge for many, as it pits players against one another in strategic battles that test their mastery over their heroes and their abilities to counter opponents.

**Strengths and Weaknesses of the Game**

Strengths of Guardian Tales lie in its compelling storytelling, evocative art style, and well-designed gameplay that encourages strategic thinking. The game's regular updates and events also help in keeping the community active and invested. However, the game's weaknesses might include a perceived grind for resources required to progress at higher levels and the potential for a pay-to-win dynamic due to its gacha system for obtaining new characters.

**Other Games Developed by the Same Developer**

Guardian Tales was developed by Kong Studios, a South Korean developer. As of my knowledge cutoff in 2023, they are prominent for this popular title, and any additional games developed by them may not be as well-known or may have been released after my last update. Keep an eye on Kong Studio's announcements for any new ventures they take on beyond Guardian Tales.