1. **Introduction of the game:**
Card Thief is a strategic card game that combines elements of stealth and strategy in a unique, digital tabletop experience. Set in a world of cloak and dagger, players take on the role of a cunning thief, navigating through various levels with the aim of pilfering treasures while avoiding detection. It's a game that challenges the intellect with its combination of stealth-based gameplay, card mechanics, and intricate level designs.

2. **All characters and levels of the game:**
The main character is the titular Card Thief, a master of stealth who players control to outsmart guards and overcome obstacles. Along the journey, players encounter various guard types, each with their own behaviors that must be strategically circumvented to successfully complete heists. The game unfolds across several meticulously crafted levels, each offering its unique layout, challenges, and opportunities to exhibit your thieving prowess.

3. **What attracts users most to the game:**
Players are often drawn to Card Thief for its deep strategic gameplay that requires careful planning and quick thinking. Its unique blend of card game mechanics with a stealth theme presents a refreshing take on the strategy genre. Moreover, the gothic art style, atmospheric audio, and the satisfaction of executing a perfect heist without being caught contribute significantly to its allure.

4. **Why it is popular:**
Card Thief has gained popularity due to its innovative approach to card gaming, offering a complex strategic experience that is easy to learn but difficult to master. The game's risk-reward system, engaging theme, and rewarding sense of progression keep players hooked for hours on end. Additionally, its success can be attributed to its ability to marry the casual ease of a mobile game with the depth of traditional card games and resource management.

5. **The most difficult part of the game:**
One challenging aspect of Card Thief that many players agree on is the steep learning curve associated with its deep strategic elements. The game requires players to think several moves ahead and to balance the interplay between light and shadow mechanics, risk management, and resource utilization effectively. Mastering these complexities is what makes Card Thief both challenging and rewarding.

6. **Strengths and weaknesses of the game:**
Strengths:
- Unique and engaging gameplay that blends card mechanics with stealth strategies.
- Beautiful artwork and a riveting, shadowy theme that immerses players.
- High replayability due to procedurally generated levels and various unlockables.

Weaknesses:
- The game's complexity might be daunting for new players or those looking for a more casual experience.
- The difficulty may spike in later levels, which can be frustrating for some users.

7. **What other games have been developed by the same developer:**
Card Thief was developed by Arnold Rauers and his studio TiNYTOUCHTALES, who are also known for other successful mobile titles such as Card Crawl and Miracle Merchant. These games have garnered positive reviews for their inventive gameplay dynamics and compelling designs, further solidifying the studio's reputation for quality card-based games.