This is a double-sided puzzle from 2020 by Kohfuh Satoh. One side is the classic 4U puzzle and the reverse is a collection of challenges using the dame pieces.
A puzzle from a fantastic designer, that everyone should attempt.
Specifications
Designer
Kohfuh Satoh
Craftsman / Manufacturer
Kohfuh Satoh
Material
Wood and acrylic
Unit of Measurement
Inches
Size
5 x 5
Grade
(A) Collector: Flaws must be very minor, subtle, and difficult to identify.
Cosmetic Issues
None
Function
(1) Perfect: Neither loose nor tight, no binding or alignment issues, moves smoothly.