The four boxes in this set of Karakuri Cube Boxes are designed in the checkered pattern which very effectively disguises the opening movements and mechanisms. The boxes are exact cubes with no distinguishing marks on any side and this makes it difficult to even know if you have the puzzle the right way up to open.
The Karakuri Creation Group's woodworking skills are very well known and the finish on these boxes is extremely high. The action to open each box is very smooth. They have used a different contrasting colour with the light Maple wood for each of the four designs so you can tell them apart.
Each of the four have different opening mechanisms to give you a range of challenges. They are not designed for you to progress from one to the other. They are quite separate challenges.
The is puzzle number 4 in the series and it is made from Tagayasan and the contrasting lighter cubes are from Maple.