1. Introduction of the game:
Monument Valley 2 is an enthralling puzzle adventure game that invites players into a world of surreal architecture and impossible geometry. Developed by ustwo games, this sequel builds upon the enchanting visual narrative that the original Monument Valley game introduced. Players guide a mother, Ro, and her child through a stunningly beautiful landscape that melds minimalist 3D design with optical illusions and intricate puzzles.

2. All characters and levels of the game:
The game prominently features two characters, Ro and her child, as they embark on a journey that explores the themes of parenthood and the bonds between parents and children. Monument Valley 2 consists of various levels, each a meticulously crafted stage that requires the player to manipulate the environment to guide the characters through mazes of optical illusions and paths that defy conventional physics.

3. What attracts users most to the game:
Users are most attracted to Monument Valley 2's unique blend of art and gameplay. The game's aesthetics are heavily influenced by a mix of artistic styles, including the graphic art of M.C. Escher, Japanese prints, and minimalist 3D design. This visual appeal, combined with tranquil soundscapes and intuitive gameplay mechanics, results in an immersive and meditative experience that captivates players.

4. Why it is popular:
Monument Valley 2 enjoys popularity due to its innovative puzzle design, compelling narrative without the use of text or dialogue, and a serene gaming atmosphere that provides a respite from the fast-paced action of many mainstream games. It is praised for its ability to challenge the mind while still providing a soothing and enjoyable experience. The game's success is also bolstered by the critical acclaim and awards received by its predecessor.

5. The most difficult part of the game:
The difficulty in Monument Valley 2 often lies in some of the later levels where players must engage in more complex manipulation of the environment to proceed. As puzzles become more elaborate, it can be challenging to discern the correct combination of moves among the many possibilities that the game presents. These challenging segments require keen spatial awareness and creative problem-solving.

6. Strengths and weaknesses of the game:
Strengths of Monument Valley 2 include its visually stunning landscapes, original sound design, and intuitive puzzle mechanics that make it accessible to a wide audience. The narrative is touching and enhances the depth of the gameplay experience. A potential weakness might be that the puzzle difficulty may not satisfy hardcore puzzle game enthusiasts, and the game's relatively short length may leave some players wanting more.

7. What other games have been developed by the same developer:
The same developer, ustwo games, is renowned for creating the original Monument Valley game, which set the stage for this inspired sequel. Additionally, they have developed other innovative games like "Assemble with Care," which focuses on storytelling and tactile puzzles, and "Whale Trail," an endless runner featuring a colorful and whimsical experience. Each game in ustwo's catalogue reflects their commitment to unique gameplay, artistic beauty, and emotional storytelling.