1. Introduction of the game:
TFT: Teamfight Tactics is a popular strategy-based auto battler game developed by Riot Games. Set in the League of Legends universe, players assemble a team of champions and strategically position them on a board to battle against other players' teams. The goal is to outwit opponents, build a powerful team composition, and ultimately emerge as the last player standing.

2. All characters and levels of the game:
Teamfight Tactics features a diverse roster of champions from the League of Legends universe. Each champion possesses unique abilities and synergies that can be combined with others to create powerful team compositions. Champions are categorized into several different classes and origins, allowing players to experiment with various strategies and playstyles. As the game progresses, players earn experience and currency to level up and unlock higher-tier champions.

3. What attracts users most to the game:
What attracts users most to TFT is the addictive nature of its gameplay. The combination of strategic decision-making, ever-changing metas, and the element of randomness keeps players engaged and coming back for more. The game offers a high level of replayability, as each match presents different challenges and opportunities to showcase one's tactical prowess.

4. Why it is popular:
TFT's popularity stems from various factors. Its accessibility appeals to both seasoned strategy game enthusiasts and newcomers to the genre, as it provides a relatively straightforward learning curve. Moreover, the constant updates, balance changes, and addition of new champions and game modes ensure the game remains fresh and exciting. The active and passionate community surrounding TFT further contributes to its popularity, fostering a competitive environment and sparking engaging discussions.

5. When the game was released and how many versions are currently available:
TFT was initially released as a game mode within League of Legends in June 2019. Due to its immense popularity, Riot Games decided to develop and launch a standalone version of the game on PC in February 2020. As of now, there have been several versions or sets released, with each set introducing new champions, abilities, and synergies to shake up the gameplay and keep it evolving.

6. The most difficult part of the game:
The most challenging aspect of TFT is undoubtedly the decision-making process. As players face a limited pool of champions and resources, they must carefully consider their choices when assembling and upgrading their teams. Adapting to the ever-changing metagame, anticipating opponents' strategies, and positioning champions effectively on the board are all critical elements that require sharp tactical thinking.

7. Strengths and weaknesses of the game:
TFT's strengths lie in its strategic depth, variety of champions and synergies, and the continuous support and updates provided by Riot Games. The game offers engaging gameplay that requires both critical thinking and adaptability. However, one of its weaknesses is the potential for a steep learning curve, as mastering the intricacies of champion synergies and optimal positioning can take time and effort.

8. What other games have been developed by the same developer:
Riot Games, the developer of Teamfight Tactics, is renowned for developing other highly successful games, most notably League of Legends. As one of the most popular multiplayer online battle arena (MOBA) games, League of Legends has attracted millions of players worldwide since its release in 2009. Riot Games has also worked on other titles such as Valorant, a tactical first-person shooter game, and Legends of Runeterra, a digital collectible card game.