Terraria

1. Introduction of the game:
Terraria is an action-adventure sandbox game that offers players a unique and immersive experience in a pixelated 2D world. Developed by Re-Logic, it allows players to explore, build, and fight in a procedurally generated world filled with treasures, challenges, and mysterious creatures.

2. All characters and levels of the game:
Terraria offers a selection of diverse characters, each with their own unique abilities and playstyles. Players can choose from a range of classes including warriors, rangers, mages, and summoners. As for levels, the game doesn't follow a traditional level-based structure. Instead, players progress by exploring the vast world and defeating bosses to unlock new items, equipment, and biomes.

3. What attracts users most to the game:
What attracts users most to Terraria is its freedom and creativity. The game provides a vast canvas for players to express their creativity by building intricate structures, exploring hidden areas, and crafting powerful weapons. The sense of discovery and adventure, coupled with the ability to shape and manipulate the environment, makes it highly engaging and addictive.

4. Why it is popular:
Terraria's popularity can be attributed to its blend of various gameplay elements. It combines the exploration and open-world aspects of games like Minecraft with the action-packed combat and boss battles found in classic platformers. The constant updates and additions brought by the developers also keep the game fresh and exciting, ensuring a dedicated player base.

5. When the game was released and how many versions are currently available:
Terraria was initially released on May 16, 2011. Since then, it has seen multiple updates and currently has two main versions available: "Terraria: Journey's End" for PC, and "Terraria Mobile 1.4" for iOS and Android.

6. The most difficult part of the game:
One of the most challenging aspects of Terraria is its boss battles. These intense encounters require precise strategies, quick reflexes, and well-equipped characters. Each boss presents unique abilities and attack patterns, providing a thrilling and often formidable obstacle for players to overcome.

7. Strengths and weaknesses of the game:
Terraria's strengths lie in its immense replayability, thanks to its vast and procedurally generated world. The game encourages creativity, exploration, and cooperation with friends through its multiplayer features. However, some players may find the learning curve steep, as there is no linear progression or guidance. Additionally, some may feel overwhelmed by the sheer amount of content and possibilities available.

8. What other games have been developed by the same developer:
Re-Logic, the developer of Terraria, has mainly focused on expanding and improving the Terraria universe. However, they have also released a few other titles including "Pixel Piracy" and "Terraria: Otherworld" (currently on hold), which offer unique gameplay experiences yet maintain the developer's dedication to pixel art aesthetics and innovative mechanics.