The SengSo 4x4 Mirror Cube brings the idea of the classic Mirror Cube to the 4x4 format, an interesting leap for anyone who has already solved a 3x3 mirror and wants a challenge with more pieces and more size variation. When scrambled, the cube loses its cubic shape and turns into an irregular object; solving means returning it to its original silhouette based on the volume of each piece.

At 67.5 mm per side and 160 g in weight, it falls within the usual range of traditional 4x4s, with the particularity that its pieces have different heights to create the shape-shifter effect. This calls for more careful visual reading than on a color-based 4x4, since you have to look at the detail of each piece to identify where it fits during reduction.

The finish, available in silver or gold depending on the version, reinforces the elegant look of the puzzle: the faces reflect light cleanly, which makes it work well as a decorative piece in a display cabinet too. The internal mechanism is designed for smooth turns despite the irregular geometry, and keeps a controlled feel throughout the whole solve.

• 4x4 shape mod of the Mirror Cube type.
• Available in silver or gold finish.
• Measurements 67.5 mm and weight 160 g.
• Solving based on shape and volume.
• Smooth turning adapted to the irregular geometry.
• Non-magnetic, oriented to enjoyment and collecting.

The manufacturer rates it as level 4 on its difficulty scale, which reflects the reality of the product well: it is not an entry puzzle but a challenge intended for those who already master the 3x3 mirror and the standard 4x4, and want to combine both concepts in a single cube. It is a good choice both for practice and as a gift for someone who already owns a classic mirror and is looking to take a step further within the same family. The metallic finish gives it an elegant look in the hand and on the shelf. In terms of maintenance, a slight tension adjustment after the first sessions helps stabilize the feel, and the absence of magnets removes any concern about the loose magnets sometimes seen on cheap magnetic cubes.

• Mirror Cube in 4x4 format
• Silver or gold finish depending on version
• Measurements 67.5 mm and weight 160 g
• Solved by shape, not by color
• Level 4 on the manufacturer's scale
• Non-magnetic, oriented to collecting and enjoyment