Develop a Prolog program that implements the declarative programming paradigm to solve problems, such as puzzles, games, and language parsing, utilizing the inbuilt logical inference engine to derive results based on set rules and facts. Ensure that the program follows a modular design and can handle various problem-solving scenarios by incorporating procedural control structures like recursion and branching. Furthermore, the code should be well-documented, testable, and easy to understand by other developers, enabling smooth collaboration for future maintenance and updates.
This prompt doesn't seem malicious.