The puzzles have the most random solutions for them, making it nearly impossible for the reader to solve. It's worse as someone that does not speak Japanese, because some of these puzzles were made with Japanese-based solutions in mind. Despite the impossible puzzles it is still fun to watch them be solved and receive somewhat complex explanations for them.
Since this is a mystery manga it is bound to have twists. The twists are not too predictable, while still making enough sense within the story to not make the reader think "well that was stupid". The plot itself can be considered lackluster, but the twists and turns help keep the reader engaged.
To help with cultural differences or language barriers, there are notes throughout the chapter explaining things to the reader, which has definitely proven helpful. Aside from the puzzles and mystery the manga can also be cute and and goofy at times, giving the reader a nice smile or chuckle.
Definitely not a manga for everyone, but it can be worth a shot.
